Vulnerability-Lookup

ALSA-2026:70642 (CVE-2026-16365)

Vulnerability from osv_almalinux – Published: 2026-09-23 00:00 – Updated: 2026-09-25 13:13 – Source website

Summary

Important: thunderbird security update

Details

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

firefox: thunderbird: Privilege escalation in the DOM: Workers component (CVE-2026-16365)
firefox: thunderbird: Sandbox escape in the Remote Settings Client component (CVE-2026-75874)
firefox: Sandbox escape due to use-after-free in the DOM: Security component (CVE-2026-84121)
firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40 (CVE-2026-84145)
firefox: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-84119)
firefox: Use-after-free in the Audio/Video component (CVE-2026-84120)
firefox: Privilege escalation due to invalid pointer in the Graphics component (CVE-2026-84131)
firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-84124)
firefox: Use-after-free in the Audio/Video component (CVE-2026-84122)
firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15 (CVE-2026-84143)
thunderbird: Uninitialized memory in MIME parsing (CVE-2026-84639)
thunderbird: Information disclosure due to malicious IMAP server response (CVE-2026-84641)
thunderbird: One byte overflow read in mail parser (CVE-2026-84640)
firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92024)
firefox: thunderbird: Mitigation bypass in the Remote Settings Client component (CVE-2026-92019)
firefox: thunderbird: Use-after-free in the Networking component (CVE-2026-92026)
firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-92031)
firefox: thunderbird: Sandbox escape due to invalid pointer in the Graphics component (CVE-2026-92032)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92010)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92006)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92011)
firefox: thunderbird: Use-after-free in the DOM: Streams component (CVE-2026-92027)
firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-92028)
firefox: thunderbird: Privilege escalation in the WebExtensions component (CVE-2026-92015)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92013)
firefox: thunderbird: Use-after-free in the Disability Access APIs component (CVE-2026-92016)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92012)
firefox: thunderbird: Use-after-free in the DOM: HTML Parser component (CVE-2026-92022)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-92014)
firefox: thunderbird: Sandbox escape in the DOM: Core & HTML component (CVE-2026-92018)
firefox: thunderbird: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-92021)
firefox: thunderbird: Use-after-free in the Audio/Video: Web Codecs component (CVE-2026-92005)
firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-92017)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92009)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-92020)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92008)
firefox: thunderbird: Mitigation bypass in the DOM: Copy & Paste and Drag & Drop component (CVE-2026-92030)
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92007)
firefox: thunderbird: Use-after-free in the DOM: Navigation component (CVE-2026-92025)
firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92029)
firefox: thunderbird: Use-after-free in the XML component (CVE-2026-92023)
thunderbird: Out-of-bounds read in IMAP response parser (CVE-2026-92240)
thunderbird: Thunderbird: Out-of-bounds read via maliciously constructed IMAP line (CVE-2026-92239)
thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers (CVE-2026-92238)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:70642	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-16365	REPORT
	https://access.redhat.com/security/cve/CVE-2026-75874	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84119	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84120	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84121	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84122	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84124	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84131	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84143	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84145	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84639	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84640	REPORT
	https://access.redhat.com/security/cve/CVE-2026-84641	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92005	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92006	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92007	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92008	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92009	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92010	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92011	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92012	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92013	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92014	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92015	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92016	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92017	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92018	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92019	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92020	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92021	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92022	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92023	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92024	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92025	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92026	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92027	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92028	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92029	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92030	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92031	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92032	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92238	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92239	REPORT
	https://access.redhat.com/security/cve/CVE-2026-92240	REPORT
	https://bugzilla.redhat.com/2503504	REPORT
	https://bugzilla.redhat.com/2517832	REPORT
	https://bugzilla.redhat.com/2526753	REPORT
	https://bugzilla.redhat.com/2526760	REPORT
	https://bugzilla.redhat.com/2526764	REPORT
	https://bugzilla.redhat.com/2526765	REPORT
	https://bugzilla.redhat.com/2526767	REPORT
	https://bugzilla.redhat.com/2526778	REPORT
	https://bugzilla.redhat.com/2526781	REPORT
	https://bugzilla.redhat.com/2527113	REPORT
	https://bugzilla.redhat.com/2527115	REPORT
	https://bugzilla.redhat.com/2527116	REPORT
	https://bugzilla.redhat.com/2533737	REPORT
	https://bugzilla.redhat.com/2533740	REPORT
	https://bugzilla.redhat.com/2533741	REPORT
	https://bugzilla.redhat.com/2533742	REPORT
	https://bugzilla.redhat.com/2533743	REPORT
	https://bugzilla.redhat.com/2533747	REPORT
	https://bugzilla.redhat.com/2533751	REPORT
	https://bugzilla.redhat.com/2533753	REPORT
	https://bugzilla.redhat.com/2533757	REPORT
	https://bugzilla.redhat.com/2533758	REPORT
	https://bugzilla.redhat.com/2533760	REPORT
	https://bugzilla.redhat.com/2533762	REPORT
	https://bugzilla.redhat.com/2533764	REPORT
	https://bugzilla.redhat.com/2533769	REPORT
	https://bugzilla.redhat.com/2533770	REPORT
	https://bugzilla.redhat.com/2533771	REPORT
	https://bugzilla.redhat.com/2533773	REPORT
	https://bugzilla.redhat.com/2533774	REPORT
	https://bugzilla.redhat.com/2533778	REPORT
	https://bugzilla.redhat.com/2533779	REPORT
	https://bugzilla.redhat.com/2533781	REPORT
	https://bugzilla.redhat.com/2533786	REPORT
	https://bugzilla.redhat.com/2533790	REPORT
	https://bugzilla.redhat.com/2533791	REPORT
	https://bugzilla.redhat.com/2533792	REPORT
	https://bugzilla.redhat.com/2533793	REPORT
	https://bugzilla.redhat.com/2533797	REPORT
	https://bugzilla.redhat.com/2533799	REPORT
	https://bugzilla.redhat.com/2534187	REPORT
	https://bugzilla.redhat.com/2534197	REPORT
	https://bugzilla.redhat.com/2534199	REPORT
	https://errata.almalinux.org/9/ALSA-2026-70642.html	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "AlmaLinux:9",
        "name": "thunderbird"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "140.16.0-1.el9_8.alma.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "Mozilla Thunderbird is a standalone mail and newsgroup client.  \n\nSecurity Fix(es):  \n\n  * firefox: thunderbird: Privilege escalation in the DOM: Workers component (CVE-2026-16365)\n  * firefox: thunderbird: Sandbox escape in the Remote Settings Client component (CVE-2026-75874)\n  * firefox: Sandbox escape due to use-after-free in the DOM: Security component (CVE-2026-84121)\n  * firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2, Firefox ESR 140.15 and Firefox ESR 115.40 (CVE-2026-84145)\n  * firefox: Sandbox escape due to use-after-free in the DOM: Navigation component (CVE-2026-84119)\n  * firefox: Use-after-free in the Audio/Video component (CVE-2026-84120)\n  * firefox: Privilege escalation due to invalid pointer in the Graphics component (CVE-2026-84131)\n  * firefox: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-84124)\n  * firefox: Use-after-free in the Audio/Video component (CVE-2026-84122)\n  * firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15 (CVE-2026-84143)\n  * thunderbird: Uninitialized memory in MIME parsing (CVE-2026-84639)\n  * thunderbird: Information disclosure due to malicious IMAP server response (CVE-2026-84641)\n  * thunderbird: One byte overflow read in mail parser (CVE-2026-84640)\n  * firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92024)\n  * firefox: thunderbird: Mitigation bypass in the Remote Settings Client component (CVE-2026-92019)\n  * firefox: thunderbird: Use-after-free in the Networking component (CVE-2026-92026)\n  * firefox: thunderbird: Information disclosure in the Graphics: ImageLib component (CVE-2026-92031)\n  * firefox: thunderbird: Sandbox escape due to invalid pointer in the Graphics component (CVE-2026-92032)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92010)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92006)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92011)\n  * firefox: thunderbird: Use-after-free in the DOM: Streams component (CVE-2026-92027)\n  * firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-92028)\n  * firefox: thunderbird: Privilege escalation in the WebExtensions component (CVE-2026-92015)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92013)\n  * firefox: thunderbird: Use-after-free in the Disability Access APIs component (CVE-2026-92016)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92012)\n  * firefox: thunderbird: Use-after-free in the DOM: HTML Parser component (CVE-2026-92022)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-92014)\n  * firefox: thunderbird: Sandbox escape in the DOM: Core \u0026 HTML component (CVE-2026-92018)\n  * firefox: thunderbird: Use-after-free in the JavaScript Engine: JIT component (CVE-2026-92021)\n  * firefox: thunderbird: Use-after-free in the Audio/Video: Web Codecs component (CVE-2026-92005)\n  * firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-92017)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92009)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-92020)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92008)\n  * firefox: thunderbird: Mitigation bypass in the DOM: Copy \u0026 Paste and Drag \u0026 Drop component (CVE-2026-92030)\n  * firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics: CanvasWebGL component (CVE-2026-92007)\n  * firefox: thunderbird: Use-after-free in the DOM: Navigation component (CVE-2026-92025)\n  * firefox: thunderbird: Use-after-free in the SVG component (CVE-2026-92029)\n  * firefox: thunderbird: Use-after-free in the XML component (CVE-2026-92023)\n  * thunderbird: Out-of-bounds read in IMAP response parser (CVE-2026-92240)\n  * thunderbird: Thunderbird: Out-of-bounds read via maliciously constructed IMAP line (CVE-2026-92239)\n  * thunderbird: Thunderbird: Memory safety violations via maliciously crafted mail headers (CVE-2026-92238)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:70642",
  "modified": "2026-09-25T13:13:32Z",
  "published": "2026-09-23T00:00:00Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:70642"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-16365"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-75874"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84119"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84120"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84121"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84122"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84124"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84131"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84143"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84145"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84639"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84640"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-84641"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92005"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92006"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92007"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92008"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92009"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92010"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92011"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92012"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92013"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92014"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92015"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92016"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92017"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92018"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92019"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92020"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92021"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92022"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92023"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92024"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92025"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92026"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92027"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92028"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92029"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92030"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92031"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92032"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92238"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92239"
    },
    {
      "type": "REPORT",
      "url": "https://access.redhat.com/security/cve/CVE-2026-92240"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2503504"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2517832"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526753"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526760"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526764"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526765"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526767"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526778"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2526781"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2527113"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2527115"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2527116"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533737"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533740"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533741"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533742"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533743"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533747"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533751"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533753"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533757"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533758"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533760"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533762"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533764"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533769"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533770"
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    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533771"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533773"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533774"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533778"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533779"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533781"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533786"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533790"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533791"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533792"
    },
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      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533793"
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    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2533799"
    },
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      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2534187"
    },
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      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2534197"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/2534199"
    },
    {
      "type": "ADVISORY",
      "url": "https://errata.almalinux.org/9/ALSA-2026-70642.html"
    }
  ],
  "related": [
    "CVE-2026-16365",
    "CVE-2026-75874",
    "CVE-2026-84119",
    "CVE-2026-84120",
    "CVE-2026-84121",
    "CVE-2026-84122",
    "CVE-2026-84124",
    "CVE-2026-84131",
    "CVE-2026-84143",
    "CVE-2026-84145",
    "CVE-2026-84639",
    "CVE-2026-84640",
    "CVE-2026-84641",
    "CVE-2026-92005",
    "CVE-2026-92006",
    "CVE-2026-92007",
    "CVE-2026-92008",
    "CVE-2026-92009",
    "CVE-2026-92010",
    "CVE-2026-92011",
    "CVE-2026-92012",
    "CVE-2026-92013",
    "CVE-2026-92014",
    "CVE-2026-92015",
    "CVE-2026-92016",
    "CVE-2026-92017",
    "CVE-2026-92018",
    "CVE-2026-92019",
    "CVE-2026-92020",
    "CVE-2026-92021",
    "CVE-2026-92022",
    "CVE-2026-92023",
    "CVE-2026-92024",
    "CVE-2026-92025",
    "CVE-2026-92026",
    "CVE-2026-92027",
    "CVE-2026-92028",
    "CVE-2026-92029",
    "CVE-2026-92030",
    "CVE-2026-92031",
    "CVE-2026-92032",
    "CVE-2026-92238",
    "CVE-2026-92239",
    "CVE-2026-92240"
  ],
  "schema_version": "1.7.0",
  "summary": "Important: thunderbird security update",
  "upstream": [
    "CVE-2026-16365",
    "CVE-2026-75874",
    "CVE-2026-84119",
    "CVE-2026-84120",
    "CVE-2026-84121",
    "CVE-2026-84122",
    "CVE-2026-84124",
    "CVE-2026-84131",
    "CVE-2026-84143",
    "CVE-2026-84145",
    "CVE-2026-84639",
    "CVE-2026-84640",
    "CVE-2026-84641",
    "CVE-2026-92005",
    "CVE-2026-92006",
    "CVE-2026-92007",
    "CVE-2026-92008",
    "CVE-2026-92009",
    "CVE-2026-92010",
    "CVE-2026-92011",
    "CVE-2026-92012",
    "CVE-2026-92013",
    "CVE-2026-92014",
    "CVE-2026-92015",
    "CVE-2026-92016",
    "CVE-2026-92017",
    "CVE-2026-92018",
    "CVE-2026-92019",
    "CVE-2026-92020",
    "CVE-2026-92021",
    "CVE-2026-92022",
    "CVE-2026-92023",
    "CVE-2026-92024",
    "CVE-2026-92025",
    "CVE-2026-92026",
    "CVE-2026-92027",
    "CVE-2026-92028",
    "CVE-2026-92029",
    "CVE-2026-92030",
    "CVE-2026-92031",
    "CVE-2026-92032",
    "CVE-2026-92238",
    "CVE-2026-92239",
    "CVE-2026-92240"
  ]
}

CVE-2026-16365 (GCVE-0-2026-16365)

Vulnerability from cvelistv5 – Published: 2026-07-21 12:37 – Updated: 2026-09-01 21:44

Title

Privilege escalation in the DOM: Workers component

Summary

Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 153, Thunderbird 153, Firefox ESR 140.15, and Thunderbird 140.15.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-24 03:55 UTC

CWE

CWE-269 - Improper Privilege Management
CWE-284 - Improper Access Control

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

5 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2049149
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153 , ≤ * (rpm)

Credits

Khanh Nguyen

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
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        "metrics": [
          {
            "cvssV3_1": {
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          "dateUpdated": "2026-07-24T20:16:53.217Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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          "lang": "en",
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          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2049149"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-71/"
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CVE-2026-75874 (GCVE-0-2026-75874)

Vulnerability from cvelistv5 – Published: 2026-08-18 12:23 – Updated: 2026-09-01 21:44

Title

Sandbox escape in the Remote Settings Client component

Summary

Sandbox escape in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Thunderbird 154, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 140.15, and Thunderbird 153.2.

Severity

10 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-18 19:23 UTC

CWE

CWE-693 - Protection Mechanism Failure

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2039972
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 154 , ≤ * (rpm)

Credits

crixer

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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          "dateUpdated": "2026-08-18T19:24:04.720Z",
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          "product": "Firefox",
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        },
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-78/"
        },
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CVE-2026-84119 (GCVE-0-2026-84119)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Sandbox escape due to use-after-free in the DOM: Navigation component

Summary

Sandbox escape due to use-after-free in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2057817
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Yaqoub Aldurayhim

Show details on NVD website

JSON

To clipboard

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      {
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          {
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              "attackVector": "NETWORK",
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            }
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        }
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-83/"
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    "dateUpdated": "2026-09-02T03:55:37.113Z",
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  },
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}

CVE-2026-84120 (GCVE-0-2026-84120)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-01 21:44

Title

Use-after-free in the Audio/Video component

Summary

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 13:47 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2058911
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Ukyo Akai

Show details on NVD website

JSON

To clipboard

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CVE-2026-84121 (GCVE-0-2026-84121)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Sandbox escape due to use-after-free in the DOM: Security component

Summary

Sandbox escape due to use-after-free in the DOM: Security component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

9.6 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2059018
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Yaqoub Aldurayhim

Show details on NVD website

JSON

To clipboard

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CVE-2026-84122 (GCVE-0-2026-84122)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-01 21:44

Title

Use-after-free in the Audio/Video component

Summary

Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 15:10 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

7 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2059965
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Hyeonjun Ahn

Show details on NVD website

JSON

To clipboard

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            }
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          "value": "Use-after-free in the Audio/Video component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2."
        }
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        "dateUpdated": "2026-09-01T21:44:10.383Z",
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          "url": "https://bugzilla.mozilla.org/show_bug.cgi?id=2059965"
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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-84/"
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CVE-2026-84124 (GCVE-0-2026-84124)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-01 21:44

Title

Use-after-free in the DOM: Core & HTML component

Summary

Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

5.4 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 15:00 UTC

CWE

CWE-416 - Use After Free

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

7 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2061110
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Hyeonjun Ahn

Show details on NVD website

JSON

To clipboard

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        "metrics": [
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CVE-2026-84131 (GCVE-0-2026-84131)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Privilege escalation due to invalid pointer in the Graphics component

Summary

Privilege escalation due to invalid pointer in the Graphics component. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-763 - Release of Invalid Pointer or Reference

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

8 references

URL	Tags
https://bugzilla.mozilla.org/show_bug.cgi?id=2060008
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

navapon

Show details on NVD website

JSON

To clipboard

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          "url": "https://www.mozilla.org/security/advisories/mfsa2026-83/"
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CVE-2026-84143 (GCVE-0-2026-84143)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:19 – Updated: 2026-09-03 17:23

Title

Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15

Summary

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-03 17:14 UTC

CWE

CWE-200 - Exposure of Sensitive Information to an Unauthorized Actor

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

9 references

URL	Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/show_bug.cgi?id=2057108
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Jan de Mooij, Tom Ritter and the Mozilla Fuzzing Team

Show details on NVD website

JSON

To clipboard

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        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-87/"
        },
        {
          "url": "https://www.mozilla.org/security/advisories/mfsa2026-88/"
        }
      ],
      "title": "Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "f16b083a-5664-49f3-a51e-8d479e5ed7fe",
    "assignerShortName": "mozilla",
    "cveId": "CVE-2026-84143",
    "datePublished": "2026-09-01T12:19:10.109Z",
    "dateReserved": "2026-09-01T07:26:01.305Z",
    "dateUpdated": "2026-09-03T17:23:35.483Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-84145 (GCVE-0-2026-84145)

Vulnerability from cvelistv5 – Published: 2026-09-01 12:18 – Updated: 2026-09-02 03:55

Title

Internally found bugs fixed in Thunderbird 155, Thunderbird ESR 153.2 and Thunderbird ESR 140.15

Summary

Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 115.40, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 00:00 UTC

CWE

CWE-119 - Improper Restriction of Operations within the Bounds of a Memory Buffer

Assigner

mozilla CNA under the mitre root

CNA scorecard E 38/100 over 683 records in the last 180 days details

References

10 references

URL	Tags
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2…
https://bugzilla.mozilla.org/show_bug.cgi?id=2055678
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…
https://www.mozilla.org/security/advisories/mfsa2…

Impacted products

2 products

Vendor	Product	Version
Mozilla	Firefox	Unaffected: 115.40 , ≤ 115.* (rpm) Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)
Mozilla	Thunderbird	Unaffected: 140.15 , ≤ 140.* (rpm) Unaffected: 153.2 , ≤ 153.* (rpm) Unaffected: 155 , ≤ * (rpm)

Credits

Leo Tenenbaum, Tom Ritter and the Mozilla Fuzzing Team

Show details on NVD website

JSON

To clipboard

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        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "HIGH",
              "attackVector": "NETWORK",
              "availabilityImpact": "HIGH",
              "baseScore": 7.5,
              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "REQUIRED",
              "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
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              "type": "ssvc"
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        "problemTypes": [
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    "cna": {
      "affected": [
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          "product": "Firefox",
          "vendor": "Mozilla",
          "versions": [
            {
              "lessThanOrEqual": "115.*",
              "status": "unaffected",
              "version": "115.40",
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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerability timeline

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