{
  "cveId": "CVE-2026-109399",
  "url": "https://patchblox.com/security/cve/CVE-2026-109399",
  "summary": "CVE-2026-109399 is fixed in swupdate on 1 platform, first by DEBIAN-CVE-2026-109399, released October 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "swupdate: SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_op...",
  "description": "SWUpdate through 2026.05.1 contains an improper certificate validation vulnerability in crypto/swupdate_cms_verify_openssl.c that trusts untrusted X.509 certificates embedded in CMS SignedData for chain building. Attackers holding a signing key from a sibling intermediate under the same root can embed that intermediate in the signature to install malicious updates.",
  "published": "2026-10-12T16:17:05Z",
  "severity": "",
  "epss": 0.00207,
  "epssPercentile": 0.10828,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "swupdate",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "2022.12\u002Bdfsg-4\u002Bdeb12u3",
      "fix": "DEBIAN-CVE-2026-109399",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-109399",
      "released": "2026-10-13T23:28:43Z"
    },
    {
      "platform": "linux",
      "product": "swupdate",
      "release": "Debian 14",
      "fixedVersion": "2026.05\u002Bdfsg-1",
      "fix": "DEBIAN-CVE-2026-109399",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-109399",
      "released": "2026-10-13T23:28:43Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}