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        "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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    "title": "Security update on CVE-2026-4893"
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    {
      "cve": "CVE-2026-4893",
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        {
          "category": "description",
          "text": "An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.",
          "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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        {
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          "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",
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          "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",
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          "url": "https://thekelleys.org.uk/dnsmasq/CVE/"
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        {
          "category": "external",
          "summary": "https://www.kb.cert.org/vuls/id/471747",
          "url": "https://www.kb.cert.org/vuls/id/471747"
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      "release_date": "2026-05-11T18:16:00Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-10-19T10:33:08.593864Z",
          "details": "This flaw only applies when dnsmasq is explicitly configured to use EDNS Client Subnet (ECS) via non-default options (for example, --add-subnet); with ECS disabled by default, the vulnerable validation path is not exercised in standard deployments. Even when ECS is enabled, the issue only permits spoofing of the ECS hint (affecting CDN/geolocation choices) and does not enable arbitrary DNS cache poisoning, bypass DNSSEC validation, escalate privilege, or impact availability. Given the prerequisite non-default configuration and the impact being limited to low-sensitivity metadata rather than DNS answer integrity or service continuity, this CVE can be safely deprioritized.",
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        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "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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        {
          "category": "impact",
          "details": "Moderate"
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}