{
  "cveId": "CVE-2026-61627",
  "url": "https://patchblox.com/security/cve/CVE-2026-61627",
  "summary": "CVE-2026-61627 is fixed in 2 products on 1 platform, first by libass9 1:0.17.1-2ubuntu0.1~esm1, released July 13, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libass: libass is a portable subtitle renderer for the \u0060ASS\u0060/SSA (Advanced Substation Alpha/Substation Alpha) subtitle format",
  "description": "libass is a portable subtitle renderer for the \u0060ASS\u0060/SSA (Advanced Substation Alpha/Substation Alpha) subtitle format. Prior to 0.17.5, libass can overread and overwrite the glyph array in \u0060wrap_lines_measure\u0060 while rendering malicious \u0060ASS\u0060 content. In \u0060wrap modes other than two\u0060, a final line ending with a literal backslash-n sequence and otherwise consisting only of such sequences or spaces can remain after early trimming and make the line-measurement loops overshoot by one glyph. When the total text size exactly matches the allocated glyph-array capacity, the first loop reads an uninitialized 32-bit fixed-point \u0060pos.x\u0060 value, although that value is not subsequently used. The second loop writes \u0060pos.x\u0060 and \u0060pos.y\u0060 beyond the array, zeroing the first and adding an attacker-controllable offset to the second. No actual exploitation beyond possible denial of service is known; broader exploitation is theoretical and constrained by the addresses, limited writes, and ASLR. This issue is fixed in version 0.17.5.",
  "published": "2026-07-13T17:00:00Z",
  "severity": "Medium",
  "epss": 0.00155,
  "epssPercentile": 0.04668,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libass",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1:0.17.1-1\u002Bdeb12u1",
      "fix": "DEBIAN-CVE-2026-61627",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-61627",
      "released": "2026-07-14T16:28:19Z"
    },
    {
      "platform": "linux",
      "product": "libass",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1:0.17.3-1\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-61627",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-61627",
      "released": "2026-07-14T16:28:19Z"
    },
    {
      "platform": "linux",
      "product": "libass",
      "release": "Debian 14",
      "fixedVersion": "1:0.17.5-1",
      "fix": "DEBIAN-CVE-2026-61627",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-61627",
      "released": "2026-07-14T16:28:19Z"
    },
    {
      "platform": "linux",
      "product": "libass9",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "1:0.17.1-2ubuntu0.1~esm1",
      "fix": "libass9 1:0.17.1-2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libass9-1-0.17.1-2ubuntu0.1-esm1",
      "released": "2026-07-13T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libass9",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "1:0.17.4-2ubuntu0.1~esm1",
      "fix": "libass9 1:0.17.4-2ubuntu0.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libass9-1-0.17.4-2ubuntu0.1-esm1",
      "released": "2026-07-13T17:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}