{
  "cveId": "CVE-2026-55480",
  "url": "https://patchblox.com/security/cve/CVE-2026-55480",
  "summary": "CVE-2026-55480 is fixed in 15 products on 1 platform, first by ALAS2023-2026-3415, released November 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "CUPS copy_model() creates a predictable PPD tempfile without O_EXCL/O_NOFOLLOW (symlink TOCTOU, lp \u2192 root)",
  "description": "When a printer is added or modified with a model PPD, the cupsd scheduler (running as root) calls copy_model() in scheduler/ipp.c, which writes the driver-generated PPD to a temporary file. The tempfile path is fully predictable (\u003CTempDir\u003E/\u003Ccon-\u003Enumber\u003E.ppd, where con-\u003Enumber is the sequential client connection id) and is opened with open(tempfile, O_WRONLY | O_CREAT | O_TRUNC, 0600) -- without O_EXCL and without O_NOFOLLOW. TempDir (/var/spool/cups/tmp) is mode 01770 root:lp, i.e. writable by the lp group that print filters run under. An lp-group process can pre-plant a symlink at the predicted path pointing at any root-owned file; root follows the symlink and truncates/overwrites the target, giving an lp - root arbitrary-file-write primitive. The codebase\u0027s own cups/tempfile.c opens temporaries safely with O_RDWR|O_CREAT|O_EXCL|O_NOFOLLOW; copy_model() is the inconsistent outlier.",
  "published": "2026-10-17T01:01:41Z",
  "severity": "Moderate",
  "cvss": 5.7,
  "cwe": "Improper Link Resolution Before File Access (\u0027Link Following\u0027)",
  "epss": 0.00202,
  "epssPercentile": 0.10321,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55480",
  "fixes": [
    {
      "platform": "linux",
      "product": "cups",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-client",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-client-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-devel",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-filesystem",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-ipptool",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-ipptool-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-libs",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-lpd",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-lpd-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-printerapp",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    },
    {
      "platform": "linux",
      "product": "cups-printerapp-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:2.4.20-1.amzn2023.0.1",
      "fix": "ALAS2023-2026-3415",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-3415",
      "released": "2026-11-10T03:55:23Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-11T13:47:35Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}