{
  "cveId": "CVE-2026-85091",
  "url": "https://patchblox.com/security/cve/CVE-2026-85091",
  "summary": "CVE-2026-85091 is fixed in 7 products on 1 platform, first by lib32z1 1:1.3.dfsg-3.1ubuntu2.3, released September 3, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "zlib 1.3.1.2 through 1.3.2 Heap Buffer Overflow via gz_vacate",
  "description": "zlib versions 1.3.1.2 through 1.3.2 contain a heap buffer overflow vulnerability in the gz_vacate() function when processing non-blocking gzwrite() operations with stale external buffer pointers. Attackers can trigger the overflow by calling gzprintf() or gzvprintf() after a write stall, causing an unchecked memmove() to write beyond the internal input buffer boundary.",
  "published": "2026-09-03T06:06:00Z",
  "severity": "Important",
  "cvss": 7.4,
  "cwe": "Out-of-bounds Write",
  "epss": 0.00469,
  "epssPercentile": 0.40822,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-85091",
  "fixes": [
    {
      "platform": "linux",
      "product": "lib32z1",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:1.3.dfsg-3.1ubuntu2.3",
      "fix": "lib32z1 1:1.3.dfsg-3.1ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-lib32z1-1-1.3.dfsg-3.1ubuntu2.3",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "lib32z1",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "fix": "lib32z1 1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-lib32z1-1-1.3.dfsg-really1.3.1-1ubuntu3.2",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "lib64z1",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:1.3.dfsg-3.1ubuntu2.3",
      "fix": "lib64z1 1:1.3.dfsg-3.1ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-lib64z1-1-1.3.dfsg-3.1ubuntu2.3",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "lib64z1",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "fix": "lib64z1 1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-lib64z1-1-1.3.dfsg-really1.3.1-1ubuntu3.2",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "libminizip1t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:1.3.dfsg-3.1ubuntu2.3",
      "fix": "libminizip1t64 1:1.3.dfsg-3.1ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libminizip1t64-1-1.3.dfsg-3.1ubuntu2.3",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "libminizip1t64",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "fix": "libminizip1t64 1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libminizip1t64-1-1.3.dfsg-really1.3.1-1ubuntu3.2",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "libx32z1",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:1.3.dfsg-3.1ubuntu2.3",
      "fix": "libx32z1 1:1.3.dfsg-3.1ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libx32z1-1-1.3.dfsg-3.1ubuntu2.3",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "libx32z1",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "fix": "libx32z1 1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libx32z1-1-1.3.dfsg-really1.3.1-1ubuntu3.2",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "minizip",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:1.3.dfsg-3.1ubuntu2.3",
      "fix": "minizip 1:1.3.dfsg-3.1ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-minizip-1-1.3.dfsg-3.1ubuntu2.3",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "minizip",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "fix": "minizip 1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-minizip-1-1.3.dfsg-really1.3.1-1ubuntu3.2",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "zlib",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-85091",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-85091",
      "released": "2026-09-03T13:06:20Z"
    },
    {
      "platform": "linux",
      "product": "zlib",
      "release": "Debian 14",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.2-4",
      "fix": "DEBIAN-CVE-2026-85091",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-85091",
      "released": "2026-09-03T13:06:20Z"
    },
    {
      "platform": "linux",
      "product": "zlib1g",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:1.3.dfsg-3.1ubuntu2.3",
      "fix": "zlib1g 1:1.3.dfsg-3.1ubuntu2.3",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-zlib1g-1-1.3.dfsg-3.1ubuntu2.3",
      "released": "2026-09-03T06:06:00Z"
    },
    {
      "platform": "linux",
      "product": "zlib1g",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "fix": "zlib1g 1:1.3.dfsg\u002Breally1.3.1-1ubuntu3.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-zlib1g-1-1.3.dfsg-really1.3.1-1ubuntu3.2",
      "released": "2026-09-03T06:06:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}