Vulnerability-Lookup

RHSA-2026:96246

Vulnerability from csaf_redhat - Published: 2026-11-09 12:39 - Updated: 2026-11-12 23:25

Summary

Red Hat Security Advisory: dnsmasq security, bug fix, and enhancement update

Severity

Important

Notes

Topic: An update for dnsmasq is now available for Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions and Red Hat Enterprise Linux 8.8 Telecommunications Update Service. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: The dnsmasq packages contain Dnsmasq, a lightweight DNS (Domain Name Server) forwarder and DHCP (Dynamic Host Configuration Protocol) server. Security Fix(es): * dnsmasq: dnsmasq: heap buffer overflow in cache via NAME_ESCAPE expansion (CVE-2026-2291) * dnsmasq: NSEC bitmap parsing infinite loop (CVE-2026-4890) * dnsmasq: RRSIG rdlen underflow leading to heap OOB read (CVE-2026-4891) * dnsmasq: DHCPv6 CLID buffer overflow in helper process (CVE-2026-4892) * dnsmasq: Broken ECS source validation bypass (CVE-2026-4893) Bug Fix(es) and Enhancement(s): * dnsmasq: New DNSSEC trust anchor key 2024 (JIRA:RHEL-272334) 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.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-2291

A heap buffer overflow was discovered in dnsmasq's DNS cache. When processing DNS responses, dnsmasq expands certain characters into longer escape sequences, but the cache buffer is not sized to hold the expanded result. A specially crafted DNS response can overflow this buffer, potentially crashing the dnsmasq process or poisoning DNS cache records.

6.5 (Medium)


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

CWE-131 - Incorrect Calculation of Buffer Size

Affected products

Fixed 5 products

Product	Version	Remediation
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-0:2.79-26.el8_8.5.ppc64le	—	Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-0:2.79-26.el8_8.5.src	—	Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-0:2.79-26.el8_8.5.x86_64	—	Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.TUS:dnsmasq-0:2.79-26.el8_8.5.src	—	Vendor Fix fix
Unresolved product id: AppStream-8.8.0.Z.TUS:dnsmasq-0:2.79-26.el8_8.5.x86_64	—	Vendor Fix fix

Known not affected 12 products

Product	Identifier	Version	Remediation
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-debuginfo-0:2.79-26.el8_8.5.ppc64le		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-debuginfo-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-debugsource-0:2.79-26.el8_8.5.ppc64le		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-debugsource-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-utils-0:2.79-26.el8_8.5.ppc64le		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-utils-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.ppc64le		—
Unresolved product id: AppStream-8.8.0.Z.E4S:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.TUS:dnsmasq-debuginfo-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.TUS:dnsmasq-debugsource-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.TUS:dnsmasq-utils-0:2.79-26.el8_8.5.x86_64		—
Unresolved product id: AppStream-8.8.0.Z.TUS:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.x86_64		—

Threats

Impact Moderate

CVE-2026-4890

A denial of service vulnerability was discovered in dnsmasq's DNSSEC validation. When parsing NSEC and NSEC3 bitmap records, the window iteration logic fails to account for the 2-byte window header when advancing through the bitmap data. A specially crafted DNS response with a zero-length bitmap can cause an infinite loop, making dnsmasq unresponsive to all queries.

7.5 (High)


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

CWE-835 - Loop with Unreachable Exit Condition

Affected products

Fixed 5 products, the same list as for CVE-2026-2291

Known not affected 12 products, the same list as for CVE-2026-2291

Threats

Impact Important

CVE-2026-4891

A heap out-of-bounds read vulnerability was discovered in dnsmasq's DNSSEC validation. When processing RRSIG records, dnsmasq calculates the signature length by subtracting the fixed field size from the record's declared data length. A crafted RRSIG record with a data length smaller than the fixed fields causes this calculation to underflow, potentially resulting in an out-of-bounds read and process crash.

7.5 (High)


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

CWE-125 - Out-of-bounds Read

Affected products

Fixed 5 products, the same list as for CVE-2026-2291

Known not affected 12 products, the same list as for CVE-2026-2291

Threats

Impact Important

CVE-2026-4892

A heap buffer overflow was discovered in dnsmasq's DHCP script helper process. When processing DHCPv6 client identifiers (CLIDs), the helper hex-encodes the raw CLID bytes into a fixed-size buffer without length validation. Since DHCPv6 CLIDs can be up to 65,535 bytes, a crafted DHCPv6 packet can overflow the buffer with attacker-controlled content. The helper process runs with root privileges.

8.8 (High)


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

CWE-122 - Heap-based Buffer Overflow

Affected products

Fixed 5 products, the same list as for CVE-2026-2291

Known not affected 12 products, the same list as for CVE-2026-2291

Threats

Impact Important

CVE-2026-4893

A validation bypass was discovered in dnsmasq's RFC 7871 client subnet (ECS) handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely bypassing ECS source validation and allowing an attacker to spoof client subnet information.

6.5 (Medium)


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

CWE-20 - Improper Input Validation

Affected products

Fixed 5 products, the same list as for CVE-2026-2291

Known not affected 12 products, the same list as for CVE-2026-2291

Threats

Impact Moderate

References

29 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:96246	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2439088	external
https://bugzilla.redhat.com/show_bug.cgi?id=2458516	external
https://bugzilla.redhat.com/show_bug.cgi?id=2458517	external
https://bugzilla.redhat.com/show_bug.cgi?id=2458518	external
https://bugzilla.redhat.com/show_bug.cgi?id=2458519	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-2291	self
https://bugzilla.redhat.com/show_bug.cgi?id=2439088	external
https://www.cve.org/CVERecord?id=CVE-2026-2291	external
https://nvd.nist.gov/vuln/detail/CVE-2026-2291	external
https://access.redhat.com/security/cve/CVE-2026-4890	self
https://bugzilla.redhat.com/show_bug.cgi?id=2458516	external
https://www.cve.org/CVERecord?id=CVE-2026-4890	external
https://nvd.nist.gov/vuln/detail/CVE-2026-4890	external
https://lists.thekelleys.org.uk/pipermail/dnsmasq…	external
https://access.redhat.com/security/cve/CVE-2026-4891	self
https://bugzilla.redhat.com/show_bug.cgi?id=2458517	external
https://www.cve.org/CVERecord?id=CVE-2026-4891	external
https://nvd.nist.gov/vuln/detail/CVE-2026-4891	external
https://access.redhat.com/security/cve/CVE-2026-4892	self
https://bugzilla.redhat.com/show_bug.cgi?id=2458518	external
https://www.cve.org/CVERecord?id=CVE-2026-4892	external
https://nvd.nist.gov/vuln/detail/CVE-2026-4892	external
https://access.redhat.com/security/cve/CVE-2026-4893	self
https://bugzilla.redhat.com/show_bug.cgi?id=2458519	external
https://www.cve.org/CVERecord?id=CVE-2026-4893	external
https://nvd.nist.gov/vuln/detail/CVE-2026-4893	external

Acknowledgments

NIST Andrew Fasano

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        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-4892",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-4892"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4892",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4892"
        },
        {
          "category": "external",
          "summary": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html",
          "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
        }
      ],
      "release_date": "2026-05-09T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-09T12:39:15+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "AppStream-8.8.0.Z.E4S:dnsmasq-0:2.79-26.el8_8.5.ppc64le",
            "AppStream-8.8.0.Z.E4S:dnsmasq-0:2.79-26.el8_8.5.src",
            "AppStream-8.8.0.Z.E4S:dnsmasq-0:2.79-26.el8_8.5.x86_64",
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          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:96246"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
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            "AppStream-8.8.0.Z.TUS:dnsmasq-0:2.79-26.el8_8.5.src",
            "AppStream-8.8.0.Z.TUS:dnsmasq-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-debuginfo-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-debugsource-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-utils-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "dnsmasq: DHCPv6 CLID buffer overflow in helper process"
    },
    {
      "cve": "CVE-2026-4893",
      "cwe": {
        "id": "CWE-20",
        "name": "Improper Input Validation"
      },
      "discovery_date": "2026-04-14T22:50:18.517000+00:00",
      "flags": [
        {
          "label": "vulnerable_code_not_present",
          "product_ids": [
            "AppStream-8.8.0.Z.E4S:dnsmasq-debuginfo-0:2.79-26.el8_8.5.ppc64le",
            "AppStream-8.8.0.Z.E4S:dnsmasq-debuginfo-0:2.79-26.el8_8.5.x86_64",
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            "AppStream-8.8.0.Z.E4S:dnsmasq-debugsource-0:2.79-26.el8_8.5.x86_64",
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            "AppStream-8.8.0.Z.TUS:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.x86_64"
          ]
        }
      ],
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2458519"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A validation bypass was discovered in dnsmasq\u0027s RFC 7871 client subnet (ECS) handling. When verifying ECS source information in DNS responses, dnsmasq passes the OPT record length instead of the full packet length to the validation function.This causes all internal bounds checks to fail, completely bypassing ECS source validation and allowing an attacker to spoof client subnet information.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "dnsmasq: Broken ECS source validation bypass",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat rates this as Moderate. This issue affects deployments with the `--add-subnet` option enabled. The impact is limited to bypassing ECS source validation, which could allow cache manipulation scoped to specific subnets or minor information disclosure about network topology.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
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          "AppStream-8.8.0.Z.TUS:dnsmasq-0:2.79-26.el8_8.5.x86_64"
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          "AppStream-8.8.0.Z.E4S:dnsmasq-debuginfo-0:2.79-26.el8_8.5.ppc64le",
          "AppStream-8.8.0.Z.E4S:dnsmasq-debuginfo-0:2.79-26.el8_8.5.x86_64",
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          "AppStream-8.8.0.Z.TUS:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.x86_64"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-4893"
        },
        {
          "category": "external",
          "summary": "RHBZ#2458519",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2458519"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-4893",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-4893"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-4893",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4893"
        },
        {
          "category": "external",
          "summary": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html",
          "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
        }
      ],
      "release_date": "2026-05-09T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-11-09T12:39:15+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:96246"
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      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
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            "baseScore": 6.5,
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            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
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          "products": [
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            "AppStream-8.8.0.Z.E4S:dnsmasq-utils-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.E4S:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.ppc64le",
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            "AppStream-8.8.0.Z.TUS:dnsmasq-debuginfo-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-debugsource-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-utils-0:2.79-26.el8_8.5.x86_64",
            "AppStream-8.8.0.Z.TUS:dnsmasq-utils-debuginfo-0:2.79-26.el8_8.5.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "dnsmasq: Broken ECS source validation bypass"
    }
  ]
}

CVE-2026-2291 (GCVE-0-2026-2291)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:47 – Updated: 2026-07-20 20:30

Title

CVE-2026-2291

Summary

dnsmasqs extract_name() function can be abused to cause a heap buffer overflow, allowing an attacker to inject false DNS cache entries, which could result in DNS lookups to redirect to an attacker-controlled IP address, or to cause a DoS.

Severity

7.3 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-13 12:38 UTC

CWE

CWE-190 - Integer Overflow or Wraparound

Assigner

certcc CNA under the mitre root

CNA scorecard E 42/100 over 183 records in the last 180 days details

References

8 references

URL	Tags
https://www.suse.com/security/cve/CVE-2026-2291.html
https://www.kb.cert.org/vuls/id/471747
https://thekelleys.org.uk/dnsmasq/CVE/
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
http://www.openwall.com/lists/oss-security/2026/0…

Impacted products

1 product

Vendor	Product	Version
dnsmasq	dnsmasq	Affected: 0 , < 2.92rel2 (custom)

Show details on NVD website

JSON

To clipboard

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      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
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              "scope": "UNCHANGED",
              "userInteraction": "NONE",
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            "other": {
              "content": {
                "id": "CVE-2026-2291",
                "options": [
                  {
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                  {
                    "Technical Impact": "partial"
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                "timestamp": "2026-05-13T12:38:54.623336Z",
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        "providerMetadata": {
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        "references": [
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      "affected": [
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        "dateUpdated": "2026-05-20T14:07:50.273Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
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      "references": [
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          "url": "https://www.suse.com/security/cve/CVE-2026-2291.html"
        },
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          "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
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      "source": {
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  "cveMetadata": {
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    "assignerShortName": "certcc",
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  "dataType": "CVE_RECORD",
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}

CVE-2026-4890 (GCVE-0-2026-4890)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:47 – Updated: 2026-09-01 12:05

Title

CVE-2026-4890

Summary

A Denial of Service (DoS) vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

Severity

7.5 (High)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 18:28 UTC

CWE

CWE-835 - Loop with Unreachable Termination
CWE-835 - Loop with Unreachable Exit Condition ('Infinite Loop')

Assigner

certcc CNA under the mitre root

CNA scorecard E 42/100 over 183 records in the last 180 days details

References

14 references

URL	Tags
https://www.kb.cert.org/vuls/id/471747
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://thekelleys.org.uk/dnsmasq/CVE/
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
https://access.redhat.com/security/cve/CVE-2026-4890	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2458516	issue-trackingx_refsource_REDHAT
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https://access.redhat.com/errata/RHSA-2026:19158	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20589	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34508	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19373	vendor-advisoryx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
dnsmasq	dnsmasq	Affected: 0 , < 2.92rel2 (custom)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.90-7.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:2.79-36.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.85-18.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:2.85-17.el9_6.1 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat OpenShift Container Platform 4.19	Unaffected: 4.19.9.6.202607151909-0 , < * (rpm) cpe:/a:redhat:openshift:4.19::el9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Show details on NVD website

JSON

To clipboard

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CVE-2026-4891 (GCVE-0-2026-4891)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:47 – Updated: 2026-09-01 12:04

Title

CVE-2026-4891

Summary

A heap-based out-of-bounds read vulnerability in the DNSSEC validation of dnsmasq allows remote attackers to cause a denial of service via a crafted DNS packet.

Severity

5.3 (Medium)


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

7.5 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 18:27 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

certcc CNA under the mitre root

CNA scorecard E 42/100 over 183 records in the last 180 days details

References

14 references

URL	Tags
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://www.kb.cert.org/vuls/id/471747
https://thekelleys.org.uk/dnsmasq/CVE/
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
https://access.redhat.com/security/cve/CVE-2026-4891	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2458517	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:40762	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19158	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20589	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34508	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19373	vendor-advisoryx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
dnsmasq	dnsmasq	Affected: 0 , < 2.92rel2 (custom)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.90-7.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:2.79-36.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.85-18.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:2.85-17.el9_6.1 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat OpenShift Container Platform 4.19	Unaffected: 4.19.9.6.202607151909-0 , < * (rpm) cpe:/a:redhat:openshift:4.19::el9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Show details on NVD website

JSON

To clipboard

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CVE-2026-4892 (GCVE-0-2026-4892)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:47 – Updated: 2026-09-01 12:04

Title

CVE-2026-4892

Summary

A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet.

Severity

8.4 (High)


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

8.8 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/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 2026-05-11 18:26 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

certcc CNA under the mitre root

CNA scorecard E 42/100 over 183 records in the last 180 days details

References

14 references

URL	Tags
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://www.kb.cert.org/vuls/id/471747
https://thekelleys.org.uk/dnsmasq/CVE/
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/pi-hole/FTL/releases/tag/v6.6.2
https://access.redhat.com/security/cve/CVE-2026-4892	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2458518	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:40762	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19158	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:20589	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34508	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:19373	vendor-advisoryx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
dnsmasq	dnsmasq	Affected: 0 , < 2.92rel2 (custom)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:2.90-7.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:2.79-36.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:2.85-18.el9_8.1 , < * (rpm) cpe:/a:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:2.85-17.el9_6.1 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat OpenShift Container Platform 4.19	Unaffected: 4.19.9.6.202607151909-0 , < * (rpm) cpe:/a:redhat:openshift:4.19::el9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7

Show details on NVD website

JSON

To clipboard

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CVE-2026-4893 (GCVE-0-2026-4893)

Vulnerability from cvelistv5 – Published: 2026-05-11 16:48 – Updated: 2026-05-20 14:09

Title

CVE-2026-4893

Summary

An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.

Severity

5.3 (Medium)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-05-11 18:28 UTC

CWE

CWE-287 - Improper Authentication

Assigner

certcc CNA under the mitre root

CNA scorecard E 42/100 over 183 records in the last 180 days details

References

6 references

URL	Tags
https://www.kb.cert.org/vuls/id/471747
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://thekelleys.org.uk/dnsmasq/CVE/
https://github.com/NixOS/nixpkgs/pull/519093
https://github.com/NixOS/nixpkgs/pull/519082
https://github.com/pi-hole/FTL/releases/tag/v6.6.2

Impacted products

1 product

Vendor	Product	Version
dnsmasq	dnsmasq	Affected: 0 , < 2.92rel2 (custom)

Show details on NVD website

JSON

To clipboard

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          "dateUpdated": "2026-05-11T18:29:00.767Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "dnsmasq",
          "vendor": "dnsmasq",
          "versions": [
            {
              "lessThan": "2.92rel2",
              "status": "affected",
              "version": "0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-287: Improper Authentication",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-20T14:09:53.804Z",
        "orgId": "37e5125f-f79b-445b-8fad-9564f167944b",
        "shortName": "certcc"
      },
      "references": [
        {
          "url": "https://www.kb.cert.org/vuls/id/471747"
        },
        {
          "url": "https://lists.thekelleys.org.uk/pipermail/dnsmasq-discuss/2026q2/018471.html"
        },
        {
          "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
        },
        {
          "url": "https://github.com/NixOS/nixpkgs/pull/519093"
        },
        {
          "url": "https://github.com/NixOS/nixpkgs/pull/519082"
        },
        {
          "url": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "CVE-2026-4893",
      "x_generator": {
        "engine": "VINCE 3.0.41",
        "env": "prod",
        "origin": "https://cveawg.mitre.org/api/cve/CVE-2026-4893"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "37e5125f-f79b-445b-8fad-9564f167944b",
    "assignerShortName": "certcc",
    "cveId": "CVE-2026-4893",
    "datePublished": "2026-05-11T16:48:15.106Z",
    "dateReserved": "2026-03-26T13:12:03.722Z",
    "dateUpdated": "2026-05-20T14:09:53.804Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:96246

CVE-2026-2291 (GCVE-0-2026-2291)

CVE-2026-4890 (GCVE-0-2026-4890)

CVE-2026-4891 (GCVE-0-2026-4891)

CVE-2026-4892 (GCVE-0-2026-4892)

CVE-2026-4893 (GCVE-0-2026-4893)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour