{
  "cveId": "CVE-2026-67194",
  "url": "https://patchblox.com/security/cve/CVE-2026-67194",
  "summary": "CVE-2026-67194 is fixed in courier on 1 platform by DEBIAN-CVE-2026-67194 (version 2.0.3-1), released July 31, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "courier: Courier IMAP before 6.0.1 and Courier Mail Server before 2.0.2 allow authenticated IMAP users to crash the imapd proc...",
  "description": "Courier IMAP before 6.0.1 and Courier Mail Server before 2.0.2 allow authenticated IMAP users to crash the imapd process via deeply nested parenthesized SEARCH queries. The SEARCH command parser (alloc_search_key in searchinfo.C) recursively descends on nested parenthesized groups through a mutual recursion chain with alloc_search_andlist() and alloc_search_notkey(), with no depth limit. Courier IMAP has no overall command line length limit, making exploitation trivial. A single IMAP command with ~2500 nested parentheses overflows the 8MB default stack, causing SIGSEGV.",
  "published": "2026-07-29T17:16:54Z",
  "severity": "",
  "epss": 0.00548,
  "epssPercentile": 0.46168,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "courier",
      "release": "Debian 14",
      "fixedVersion": "2.0.3-1",
      "fix": "DEBIAN-CVE-2026-67194",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-67194",
      "released": "2026-07-31T14:18:19Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}