{
  "cveId": "CVE-2026-86138",
  "url": "https://patchblox.com/security/cve/CVE-2026-86138",
  "summary": "CVE-2026-86138 is fixed in 11 products on 1 platform, first by RHSA-2026:89759, released August 28, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.",
  "description": "In libxml2 before 2.15.4, xmlDictAddQString in dict.c has an integer overflow and resultant heap-based buffer overflow.",
  "published": "2026-09-04T22:17:00Z",
  "severity": "Moderate",
  "cvss": 8.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
  "cwe": "Integer Overflow or Wraparound",
  "epss": 0.00132,
  "epssPercentile": 0.0279,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-86138",
  "fixes": [
    {
      "platform": "linux",
      "product": "libxml2",
      "release": "Debian 14",
      "fixedVersion": "2.15.4\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-86138",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-86138",
      "released": "2026-09-11T12:23:55Z"
    },
    {
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      "product": "libxml2",
      "release": "RHEL 10",
      "fixedVersion": "2.12.5-9.el10_0.9",
      "fix": "RHSA-2026:89759",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-89759",
      "released": "2026-08-28T00:38:13Z"
    },
    {
      "platform": "linux",
      "product": "libxml2",
      "release": "RHEL 8",
      "fixedVersion": "0:2.9.7-21.el8_10.9",
      "fix": "RHSA-2026:71641",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-71641",
      "released": "2026-09-24T19:31:17Z"
    },
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      "release": "RHEL 9",
      "fixedVersion": "0:2.9.13-14.el9_8.5",
      "fix": "RHSA-2026:71585",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-71585",
      "released": "2026-09-25T19:43:43Z"
    },
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      "product": "libxml2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.9.4\u002Bdfsg1-6.1ubuntu1.9\u002Besm9",
      "fix": "libxml2 2.9.4\u002Bdfsg1-6.1ubuntu1.9\u002Besm9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libxml2-2.9.4-dfsg1-6.1ubuntu1.9-esm9",
      "released": "2026-10-09T22:35:50Z"
    },
    {
      "platform": "linux",
      "product": "libxml2",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.9.10\u002Bdfsg-5ubuntu0.20.04.10\u002Besm6",
      "fix": "libxml2 2.9.10\u002Bdfsg-5ubuntu0.20.04.10\u002Besm6",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libxml2-2.9.10-dfsg-5ubuntu0.20.04.10-esm6",
      "released": "2026-10-09T22:35:56Z"
    },
    {
      "platform": "linux",
      "product": "libxml2",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libxml2-2.9.13-dfsg-1ubuntu0.14",
      "released": "2026-10-09T22:35:58Z"
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      "platform": "linux",
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      "release": "Ubuntu 24.04.5 LTS (noble)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libxml2-2.9.14-dfsg-1.3ubuntu3.10",
      "released": "2026-10-09T22:36:01Z"
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      "fix": "RLSA-2026:71586",
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      "fix": "RLSA-2026:71641",
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      "released": "2026-09-25T18:04:58Z"
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      "platform": "linux",
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      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-libxml2",
      "release": "amzn 2023",
      "fixedVersion": "2.10.4-1.amzn2023.0.21",
      "fix": "ALAS2023-2026-3122",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3122",
      "released": "2026-09-28T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-libxml2",
      "release": "ol 10",
      "fixedVersion": "0:2.12.5-10.el10_2.4",
      "fix": "ELSA-2026-71586",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71586",
      "released": "2026-09-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-libxml2",
      "release": "ol 8",
      "fixedVersion": "0:2.9.7-21.el8_10.9",
      "fix": "ELSA-2026-71641",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71641",
      "released": "2026-09-25T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-libxml2",
      "release": "ol 9",
      "fixedVersion": "0:2.9.13-14.el9_8.5",
      "fix": "ELSA-2026-71585",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-71585",
      "released": "2026-09-24T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "python3-libxml2-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "2.10.4-1.amzn2023.0.21",
      "fix": "ALAS2023-2026-3122",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3122",
      "released": "2026-09-28T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}