{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "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"
      },
      {
        "category": "details",
        "text": "* SECURITY UPDATE: heap buffer overflow after a failed write\n     - debian/patches/CVE-2026-76844.patch: in gzwrite.c reset\n       strm.next_in/avail_in when gz_comp() fails in gz_write().\n     - CVE-2026-76844",
        "title": "Details"
      }
    ],
    "publisher": {
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      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
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        "category": "self",
        "summary": "https://cve.tuxcare.com/els/releases/CLSA-2026:1791506807",
        "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1791506807"
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      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/advisories/2026/clsa-2026_1791506807.json"
      }
    ],
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      "current_release_date": "2026-10-09T00:47:39Z",
      "generator": {
        "date": "2026-10-09T00:47:39Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CLSA-2026:1791506807",
      "initial_release_date": "2026-10-09T00:47:39Z",
      "revision_history": [
        {
          "date": "2026-10-09T00:47:39Z",
          "number": "1",
          "summary": "Initial version"
        }
      ],
      "status": "final",
      "version": "1"
    },
    "title": "Fix CVE(s): CVE-2026-76844"
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      "cve": "CVE-2026-76844",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "notes": [
        {
          "category": "description",
          "text": "zlib 1.2.11 through 1.3.2 contains a heap buffer overflow: after an underlying write() fails, gz_write() returns without resetting strm.next_in, leaving it pointed at the caller's buffer. A later gz* write call then derives a position from the stale pointer and writes past a heap allocation; any write() failure reaches it, including EPIPE on a blocking descriptor, and in versions before 1.3.1.2 the failed write must be followed by a gzclearerr() call.",
          "title": "Vulnerability description"
        }
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          "Debian-10:zlib1g-dev-1:1.2.11.dfsg-1+deb10u2+tuxcare.els1.armel"
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-76844"
        },
        {
          "category": "external",
          "summary": "https://gist.github.com/thesmartshadow/e0b9481792afb7c31e86fee1ff084490",
          "url": "https://gist.github.com/thesmartshadow/e0b9481792afb7c31e86fee1ff084490"
        },
        {
          "category": "external",
          "summary": "https://github.com/madler/zlib",
          "url": "https://github.com/madler/zlib"
        },
        {
          "category": "external",
          "summary": "https://github.com/madler/zlib/blob/v1.3.2/gzwrite.c#L393",
          "url": "https://github.com/madler/zlib/blob/v1.3.2/gzwrite.c#L393"
        },
        {
          "category": "external",
          "summary": "https://github.com/madler/zlib/commit/df84af25dc1942490e1d1c899a07619152a46148",
          "url": "https://github.com/madler/zlib/commit/df84af25dc1942490e1d1c899a07619152a46148"
        },
        {
          "category": "external",
          "summary": "https://www.vulncheck.com/advisories/zlib-1.3.1.2-through-1.3.2-heap-buffer-overflow-via-gz-vacate",
          "url": "https://www.vulncheck.com/advisories/zlib-1.3.1.2-through-1.3.2-heap-buffer-overflow-via-gz-vacate"
        }
      ],
      "release_date": "2026-08-24T14:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-09T00:46:49.258830Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1791506807",
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            "Debian-10:zlib1g-dev-1:1.2.11.dfsg-1+deb10u2+tuxcare.els1.armel"
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      "threats": [
        {
          "category": "impact",
          "details": "Important"
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    }
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}