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    "distribution": {
      "text": "TuxCare License Agreement",
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        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "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 Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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        {
          "date": "2026-05-11T18:16:00Z",
          "number": "1",
          "summary": "Initial version"
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        {
          "date": "2026-10-25T05:35:30Z",
          "number": "2",
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      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2026-2291"
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  "vulnerabilities": [
    {
      "cve": "CVE-2026-2291",
      "notes": [
        {
          "category": "description",
          "text": "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.",
          "title": "Vulnerability description"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "Oracle-Linux-7:dnsmasq-0:2.76-17.0.3.el7_9.99.tuxcare.els5.x86_64",
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          "Oracle-Linux-7:dnsmasq-utils-0:2.76-17.0.3.el7_9.99.tuxcare.els5.x86_64",
          "Oracle-Linux-7:dnsmasq-utils-0:2.76-17.0.3.el7_9.99.x86_64"
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          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-2291"
        },
        {
          "category": "external",
          "summary": "https://github.com/NixOS/nixpkgs/pull/519082",
          "url": "https://github.com/NixOS/nixpkgs/pull/519082"
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        {
          "category": "external",
          "summary": "https://github.com/NixOS/nixpkgs/pull/519093",
          "url": "https://github.com/NixOS/nixpkgs/pull/519093"
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        {
          "category": "external",
          "summary": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2",
          "url": "https://github.com/pi-hole/FTL/releases/tag/v6.6.2"
        },
        {
          "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"
        },
        {
          "category": "external",
          "summary": "https://thekelleys.org.uk/dnsmasq/CVE/",
          "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
        },
        {
          "category": "external",
          "summary": "https://www.kb.cert.org/vuls/id/471747",
          "url": "https://www.kb.cert.org/vuls/id/471747"
        },
        {
          "category": "external",
          "summary": "https://www.suse.com/security/cve/CVE-2026-2291.html",
          "url": "https://www.suse.com/security/cve/CVE-2026-2291.html"
        },
        {
          "category": "external",
          "summary": "http://www.openwall.com/lists/oss-security/2026/07/20/14",
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      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-10-19T10:33:08.749060Z",
          "details": "This flaw is only reachable via crafted DNS responses and requires an attacker to win a high‑complexity cache‑poisoning race or control an upstream resolver; with modern source‑port and transaction‑ID randomization, reliable off‑path spoofing against servers/VMs is impractical. Its impact profile excludes confidentiality and limits integrity to false cache entries, making the primary effect availability disruption rather than data compromise or code execution. Systems not running dnsmasq—or using it solely as a local stub resolver—are not meaningfully exposed to network attackers, so this can be safely deprioritized.",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H",
            "version": "3.1"
          },
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      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
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    }
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}