{
  "cveId": "CVE-2026-77640",
  "url": "https://patchblox.com/security/cve/CVE-2026-77640",
  "summary": "CVE-2026-77640 is fixed in tor on 1 platform, first by DEBIAN-CVE-2026-77640, released August 21, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "tor: tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip  stream with done=1",
  "description": "tor before 0.4.9.9 was prone to an infinite loop when decompressing a truncated zlib/gzip  stream with done=1. A truncated stream never reaches Z_STREAM_END,  causing zlib to return Z_BUF_ERROR with no input remaining, which  buf_add_compress() mistook for a full output buffer and retried forever. Fixed by returning TOR_COMPRESS_ERROR in that case so the caller can abort cleanly. This is TROVE-2026-021.",
  "published": "2026-08-20T21:17:11Z",
  "severity": "medium",
  "cvss": 5.3,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
  "epss": 0.00378,
  "epssPercentile": 0.3198,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "tor",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "0.4.9.9-1",
      "fix": "DEBIAN-CVE-2026-77640",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-77640",
      "released": "2026-08-21T23:37:15Z"
    },
    {
      "platform": "linux",
      "product": "tor",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.4.9.11-0\u002Bdeb13u1",
      "fix": "DEBIAN-CVE-2026-77640",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-77640",
      "released": "2026-08-21T23:37:15Z"
    },
    {
      "platform": "linux",
      "product": "tor",
      "release": "Debian 14",
      "fixedVersion": "0.4.9.9-1",
      "fix": "DEBIAN-CVE-2026-77640",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-77640",
      "released": "2026-08-21T23:37:15Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}