{
  "cveId": "CVE-2026-20338",
  "url": "https://patchblox.com/security/cve/CVE-2026-20338",
  "summary": "CVE-2026-20338 is fixed in 9 products on 1 platform, first by clamav 1.5.4\u002Bdfsg-0ubuntu0.22.04.1, released August 7, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ClamAV ZIP File Format Processing Memory Corruption Vulnerability",
  "description": "A vulnerability in the zip archive parser of ClamAV could allow an unauthenticated, remote attacker to cause a DoS condition on an affected device. This vulnerability is due to improper memory handling when processing content in zip files during scanning. An attacker could exploit this vulnerability by submitting a crafted zip file for scanning. A successful exploit could allow the attacker to cause the ClamAV scanning process to terminate as a result of a memory double-free, resulting in a DoS condition on the affected software.",
  "published": "2026-08-07T10:17:00Z",
  "severity": "Important",
  "cvss": 7.5,
  "cwe": "Double Free",
  "epss": 0.00558,
  "epssPercentile": 0.46752,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20338",
  "fixes": [
    {
      "platform": "linux",
      "product": "clamav",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.5.4-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21831-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21831-1",
      "released": "2026-09-11T12:01:10Z"
    },
    {
      "platform": "linux",
      "product": "clamav",
      "release": "sles 15.6",
      "fixedVersion": "1.5.4-150600.18.31.1",
      "fix": "SUSE-SU-2026:4180-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4180-1",
      "released": "2026-09-14T14:49:34Z"
    },
    {
      "platform": "linux",
      "product": "clamav",
      "release": "sles 15.7",
      "fixedVersion": "1.5.4-150600.18.31.1",
      "fix": "SUSE-SU-2026:4180-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4180-1",
      "released": "2026-09-14T14:49:34Z"
    },
    {
      "platform": "linux",
      "product": "clamav",
      "release": "sles 16.0",
      "fixedVersion": "1.5.4-160000.1.1",
      "fix": "SUSE-SU-2026:23727-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-23727-1",
      "released": "2026-09-11T12:00:06Z"
    },
    {
      "platform": "linux",
      "product": "clamav-base",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav-base 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-base-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-base",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav-base 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-base-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-base",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav-base 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-base-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-daemon",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav-daemon 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-daemon-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-daemon",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav-daemon 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-daemon-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-daemon",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav-daemon 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-daemon-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-docs",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav-docs 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-docs-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-docs",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav-docs 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-docs-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-docs",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav-docs 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-docs-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-freshclam",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav-freshclam 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-freshclam-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-freshclam",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav-freshclam 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-freshclam-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-freshclam",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav-freshclam 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-freshclam-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-milter",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav-milter 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-milter-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-milter",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav-milter 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-milter-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-milter",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav-milter 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-milter-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-testfiles",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamav-testfiles 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamav-testfiles-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-testfiles",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamav-testfiles 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamav-testfiles-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamav-testfiles",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamav-testfiles 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamav-testfiles-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamdscan",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "clamdscan 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-clamdscan-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamdscan",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "clamdscan 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-clamdscan-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "clamdscan",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "clamdscan 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-clamdscan-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libclamav12",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "fix": "libclamav12 1.5.4\u002Bdfsg-0ubuntu0.22.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libclamav12-1.5.4-dfsg-0ubuntu0.22.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libclamav12",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "fix": "libclamav12 1.5.4\u002Bdfsg-0ubuntu0.24.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libclamav12-1.5.4-dfsg-0ubuntu0.24.04.1",
      "released": "2026-08-07T10:17:00Z"
    },
    {
      "platform": "linux",
      "product": "libclamav12",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "fix": "libclamav12 1.5.4\u002Bdfsg-0ubuntu0.26.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libclamav12-1.5.4-dfsg-0ubuntu0.26.04.1",
      "released": "2026-08-07T10:17:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}