{
  "cveId": "CVE-2026-34743",
  "url": "https://patchblox.com/security/cve/CVE-2026-34743",
  "summary": "CVE-2026-34743 is fixed in 7 products on 1 platform, first by liblzma5 5.2.2-1.3ubuntu0.1\u002Besm1, released April 2, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "XZ Utils: Buffer overflow in lzma_index_append()",
  "description": "XZ Utils provide a general-purpose data-compression library plus command-line tools. Prior to version 5.8.3, if lzma_index_decoder() was used to decode an Index that contained no Records, the resulting lzma_index was left in a state where where a subsequent lzma_index_append() would allocate too little memory, and a buffer overflow would occur. This issue has been patched in version 5.8.3.",
  "published": "2026-04-02T12:21:00Z",
  "severity": "Low",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "cwe": "Heap-based Buffer Overflow",
  "epss": 0.00534,
  "epssPercentile": 0.45338,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-34743",
  "fixes": [
    {
      "platform": "linux",
      "product": "liblzma5",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "5.2.2-1.3ubuntu0.1\u002Besm1",
      "fix": "liblzma5 5.2.2-1.3ubuntu0.1\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-liblzma5-5.2.2-1.3ubuntu0.1-esm1",
      "released": "2026-04-02T12:21:00Z"
    },
    {
      "platform": "linux",
      "product": "liblzma5",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "5.2.4-1ubuntu1.1\u002Besm1",
      "fix": "liblzma5 5.2.4-1ubuntu1.1\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-liblzma5-5.2.4-1ubuntu1.1-esm1",
      "released": "2026-04-02T12:21:00Z"
    },
    {
      "platform": "linux",
      "product": "liblzma5",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "5.2.5-2ubuntu1.1",
      "fix": "liblzma5 5.2.5-2ubuntu1.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-liblzma5-5.2.5-2ubuntu1.1",
      "released": "2026-04-02T12:21:00Z"
    },
    {
      "platform": "linux",
      "product": "liblzma5",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "5.6.1\u002Breally5.4.5-1ubuntu0.3",
      "fix": "liblzma5 5.6.1\u002Breally5.4.5-1ubuntu0.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-liblzma5-5.6.1-really5.4.5-1ubuntu0.3",
      "released": "2026-04-02T12:21:00Z"
    },
    {
      "platform": "linux",
      "product": "liblzma5",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "5.8.1-1ubuntu0.1",
      "fix": "liblzma5 5.8.1-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-liblzma5-5.8.1-1ubuntu0.1",
      "released": "2026-04-02T12:21:00Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "RHEL 10",
      "fixedVersion": "5.6.2-4.el10_2.1",
      "fix": "RHSA-2026:64787",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-64787",
      "released": "2026-04-02T18:36:37Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "RHEL 9",
      "fixedVersion": "0:5.2.5-8.el9_8.1",
      "fix": "RHSA-2026:89749",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-89749",
      "released": "2026-10-27T21:16:57Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "almalinux 10",
      "fixedVersion": "1:5.6.2-4.el10_2.1",
      "fix": "ALSA-2026:64787",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-64787",
      "released": "2026-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "almalinux 9",
      "fixedVersion": "5.2.5-8.el9_8.1",
      "fix": "ALSA-2026:89749",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-89749",
      "released": "2026-11-07T00:40:32Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "ol 10",
      "fixedVersion": "1:5.6.2-4.el10_2.1",
      "fix": "ELSA-2026-64787-0",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-64787-0",
      "released": "2026-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "ol 9",
      "fixedVersion": "0:5.2.5-8.el9_8.1",
      "fix": "ELSA-2026-89749",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-89749",
      "released": "2026-11-07T00:52:27Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "rocky 10",
      "fixedVersion": "1:5.6.2-4.el10_2.1",
      "fix": "RLSA-2026:64787",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-64787",
      "released": "2026-09-09T12:09:16Z"
    },
    {
      "platform": "linux",
      "product": "xz",
      "release": "rocky 9",
      "fixedVersion": "0:5.2.5-8.el9_8.1",
      "fix": "RLSA-2026:89749",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2026-89749",
      "released": "2026-11-07T00:39:57Z"
    },
    {
      "platform": "linux",
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      "fixedVersion": "0:5.2.5-8.el9_8.1",
      "fix": "RHSA-2026:89749",
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      "released": "2026-10-27T21:16:57Z"
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    {
      "platform": "linux",
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      "release": "almalinux 10",
      "fixedVersion": "1:5.6.2-4.el10_2.1",
      "fix": "ALSA-2026:64787",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-64787",
      "released": "2026-09-08T00:00:00Z"
    },
    {
      "platform": "linux",
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      "release": "almalinux 9",
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      "fix": "ALSA-2026:89749",
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      "released": "2026-11-07T00:40:32Z"
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      "fix": "ELSA-2026-64787-0",
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      "released": "2026-09-08T00:00:00Z"
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      "fix": "ELSA-2026-89749",
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      "released": "2026-11-07T00:52:27Z"
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    {
      "platform": "linux",
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      "fix": "RHSA-2026:89749",
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      "released": "2026-10-27T21:16:57Z"
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    {
      "platform": "linux",
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      "fix": "ALSA-2026:64787",
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      "fix": "ALSA-2026:89749",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-89749",
      "released": "2026-11-07T00:40:32Z"
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    {
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      "fix": "ELSA-2026-64787-0",
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      "released": "2026-09-08T00:00:00Z"
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    {
      "platform": "linux",
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      "fix": "ELSA-2026-89749",
      "url": "https://patchblox.com/security/fix/linux/elsa-2026-89749",
      "released": "2026-11-07T00:52:27Z"
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    {
      "platform": "linux",
      "product": "xz-lzma-compat",
      "release": "RHEL 9",
      "fixedVersion": "0:5.2.5-8.el9_8.1",
      "fix": "RHSA-2026:89749",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2026-89749",
      "released": "2026-10-27T21:16:57Z"
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    {
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      "fix": "ALSA-2026:64787",
      "url": "https://patchblox.com/security/fix/linux/alsa-2026-64787",
      "released": "2026-09-08T00:00:00Z"
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      "platform": "linux",
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      "fix": "ALSA-2026:89749",
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      "released": "2026-11-07T00:40:32Z"
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      "product": "xz-lzma-compat",
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      "fix": "ELSA-2026-64787-0",
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      "released": "2026-09-08T00:00:00Z"
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      "fix": "ELSA-2026-89749",
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      "released": "2026-11-07T00:52:27Z"
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    {
      "platform": "linux",
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      "release": "Debian 12.15 (bookworm)",
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      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-34743",
      "released": "2026-04-02T19:21:33Z"
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      "released": "2026-04-02T12:21:00Z"
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      "released": "2026-04-02T12:21:00Z"
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      "product": "xz-utils",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-xz-utils-5.6.1-really5.4.5-1ubuntu0.3",
      "released": "2026-04-02T12:21:00Z"
    },
    {
      "platform": "linux",
      "product": "xz-utils",
      "release": "Ubuntu 25.10 (questing)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-xz-utils-5.8.1-1ubuntu0.1",
      "released": "2026-04-02T12:21:00Z"
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      "released": "2026-04-02T12:21:00Z"
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    {
      "platform": "linux",
      "product": "xzdec",
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      "released": "2026-04-02T12:21:00Z"
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-xzdec-5.2.5-2ubuntu1.1",
      "released": "2026-04-02T12:21:00Z"
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      "released": "2026-04-02T12:21:00Z"
    }
  ],
  "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"
  }
}