RLSA-2026:80694 (CVE-2026-100756)

Vulnerability from osv_rocky – Published: 2026-10-24 00:04 – Updated: 2026-10-25 07:10 – Source website
VLAI
Summary
Important: thunderbird security update
Details

Mozilla Thunderbird is a standalone mail and newsgroup client.

Security Fix(es):

  • firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832)

  • firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784)

  • firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794)

  • firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820)

  • firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777)

  • firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766)

  • firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779)

  • firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807)

  • firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792)

  • firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819)

  • firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776)

  • firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757)

  • firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786)

  • firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869)

  • firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770)

  • firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769)

  • firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100791)

  • firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-100818)

  • firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-100782)

  • firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811)

  • firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100772)

  • firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759)

  • firefox: Sandbox escape due to use-after-free in the DOM: Core & HTML component (CVE-2026-100778)

  • firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758)

  • firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775)

  • firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-100781)

  • firefox: Use-after-free in the DOM: Core & HTML component (CVE-2026-100774)

  • firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803)

  • firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789)

  • firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100785)

  • firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821)

  • firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788)

  • firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771)

  • firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762)

  • firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790)

  • firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773)

  • firefox: thunderbird: Use-after-free in the DOM: Core & HTML component (CVE-2026-100780)

  • firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767)

  • firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-100756)

  • firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783)

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.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Credits
Rocky Enterprise Software Foundation
Red Hat
References
https://errata.rockylinux.org/RLSA-2026:80694 ADVISORY
https://bugzilla.redhat.com/show_bug.cgi?id=2543113 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543114 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543116 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543120 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543121 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543123 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543125 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543128 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543130 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543131 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543133 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543134 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543137 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543140 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543142 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543144 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543145 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543146 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543149 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543150 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543152 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543154 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543155 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543156 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543157 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543159 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543160 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543161 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543163 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543164 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543166 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543167 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543172 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543174 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543177 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543182 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543183 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543185 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543187 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543188 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543192 REPORT
https://bugzilla.redhat.com/show_bug.cgi?id=2543193 REPORT
https://access.redhat.com/errata/RHSA-2026:80694 ADVISORY
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Rocky Linux:9",
        "name": "thunderbird",
        "purl": "pkg:rpm/rocky-linux/thunderbird?distro=rocky-linux-9\u0026epoch=0"
      },
      "ranges": [
        {
          "database_specific": {
            "yum_repository": "AppStream"
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0:140.17.0-1.el9_8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [
    {
      "name": "Rocky Enterprise Software Foundation"
    },
    {
      "name": "Red Hat"
    }
  ],
  "database_specific": {
    "license": "CC-BY-4.0",
    "license_url": "https://creativecommons.org/licenses/by/4.0/",
    "source_advisory": "RHSA-2026:80694"
  },
  "details": "Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nSecurity Fix(es):\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100832)\n\n* firefox: Use-after-free in the Layout: Text and Fonts component (CVE-2026-100784)\n\n* firefox: thunderbird: Privilege escalation in the DLL Services component (CVE-2026-100801)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Internationalization component (CVE-2026-100794)\n\n* firefox: thunderbird: Privilege escalation in the Address Bar component (CVE-2026-100820)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100777)\n\n* firefox: thunderbird: Information disclosure in the Networking: JAR component (CVE-2026-100766)\n\n* firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100779)\n\n* firefox: thunderbird: Privilege escalation in the DOM: Service Workers component (CVE-2026-100807)\n\n* firefox: thunderbird: JIT miscompilation in the JavaScript: WebAssembly component (CVE-2026-100792)\n\n* firefox: Privilege escalation due to use-after-free in the Graphics: WebRender component (CVE-2026-100797)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the XPCOM component (CVE-2026-100819)\n\n* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100776)\n\n* firefox: thunderbird: Use-after-free in the Widget component (CVE-2026-100757)\n\n* firefox: Sandbox escape due to use-after-free in the Graphics component (CVE-2026-100786)\n\n* firefox: thunderbird: Information disclosure in the Networking component (CVE-2026-96869)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100770)\n\n* firefox: thunderbird: Use-after-free in the JavaScript: WebAssembly component (CVE-2026-100769)\n\n* firefox: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100791)\n\n* firefox: thunderbird: Sandbox escape due to use-after-free in the Widget: Gtk component (CVE-2026-100818)\n\n* firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component (CVE-2026-100782)\n\n* firefox: firefox: Sandbox escape via use-after-free in DOM component (CVE-2026-100811)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100772)\n\n* firefox: thunderbird: Uninitialized memory in the Storage: Quota Manager component (CVE-2026-100759)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100778)\n\n* firefox: thunderbird: Sandbox escape in the DOM: Navigation component (CVE-2026-100758)\n\n* firefox: thunderbird: Sandbox escape in the Graphics component (CVE-2026-100775)\n\n* firefox: thunderbird: Sandbox escape due to incorrect boundary conditions in the Graphics: WebRender component (CVE-2026-100781)\n\n* firefox: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100774)\n\n* firefox: thunderbird: Same-origin policy bypass in the WebExtensions component (CVE-2026-100803)\n\n* firefox: thunderbird: Use-after-free in the Graphics: Canvas2D component (CVE-2026-100789)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100785)\n\n* firefox: thunderbird: Site isolation issue in the Panning and Zooming component (CVE-2026-100821)\n\n* firefox: thunderbird: Invalid pointer in the JavaScript: WebAssembly component (CVE-2026-100788)\n\n* firefox: thunderbird: Undefined behavior in the DOM: Streams component (CVE-2026-100771)\n\n* firefox: Sandbox escape due to use-after-free in the DOM: Content Processes component (CVE-2026-100762)\n\n* firefox: thunderbird: Use-after-free in the XSLT component (CVE-2026-100790)\n\n* firefox: thunderbird: Use-after-free in the Storage: IndexedDB component (CVE-2026-100773)\n\n* firefox: thunderbird: Use-after-free in the DOM: Core \u0026 HTML component (CVE-2026-100780)\n\n* firefox: thunderbird: Use-after-free in the Networking: Cache component (CVE-2026-100767)\n\n* firefox: thunderbird: Incorrect boundary conditions in the Audio/Video: Playback component (CVE-2026-100756)\n\n* firefox: thunderbird: Uninitialized memory in the Audio/Video component (CVE-2026-100783)\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.",
  "id": "RLSA-2026:80694",
  "modified": "2026-10-25T07:10:51.039552Z",
  "published": "2026-10-24T00:04:21.976358Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://errata.rockylinux.org/RLSA-2026:80694"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543113"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543114"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543116"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543120"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543121"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543123"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543125"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543128"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543130"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543131"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543133"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543134"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543137"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543140"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543142"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543144"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543145"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543146"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543149"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543150"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543152"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543154"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543155"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543156"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543157"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543159"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543160"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543161"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543163"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543164"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543166"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543167"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543172"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543174"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543177"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543182"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543183"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543185"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543187"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543188"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543192"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2543193"
    },
    {
      "type": "ADVISORY",
      "url": "https://access.redhat.com/errata/RHSA-2026:80694"
    }
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Important: thunderbird security update",
  "upstream": [
    "CVE-2026-100756",
    "CVE-2026-100757",
    "CVE-2026-100758",
    "CVE-2026-100759",
    "CVE-2026-100762",
    "CVE-2026-100766",
    "CVE-2026-100767",
    "CVE-2026-100769",
    "CVE-2026-100770",
    "CVE-2026-100771",
    "CVE-2026-100772",
    "CVE-2026-100773",
    "CVE-2026-100774",
    "CVE-2026-100775",
    "CVE-2026-100776",
    "CVE-2026-100777",
    "CVE-2026-100778",
    "CVE-2026-100779",
    "CVE-2026-100780",
    "CVE-2026-100781",
    "CVE-2026-100782",
    "CVE-2026-100783",
    "CVE-2026-100784",
    "CVE-2026-100785",
    "CVE-2026-100786",
    "CVE-2026-100788",
    "CVE-2026-100789",
    "CVE-2026-100790",
    "CVE-2026-100791",
    "CVE-2026-100792",
    "CVE-2026-100794",
    "CVE-2026-100797",
    "CVE-2026-100801",
    "CVE-2026-100803",
    "CVE-2026-100807",
    "CVE-2026-100811",
    "CVE-2026-100818",
    "CVE-2026-100819",
    "CVE-2026-100820",
    "CVE-2026-100821",
    "CVE-2026-100832",
    "CVE-2026-96869"
  ]
}



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