{
  "cveId": "CVE-2026-6691",
  "url": "https://patchblox.com/security/cve/CVE-2026-6691",
  "summary": "CVE-2026-6691 is fixed in mongo-c-driver on 1 platform, first by DEBIAN-CVE-2026-6691, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "mongo-c-driver: The MongoDB C Driver\u0027s Cyrus SASL integration performs unsafe string copying during username canonicalization, enabli...",
  "description": "The MongoDB C Driver\u0027s Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or network traffic. This may be triggered by passing untrusted input in the username of a MongoDB URI with authMechanism=GSSAPI.",
  "published": "2026-05-06T16:16:11Z",
  "severity": "",
  "epss": 0.00126,
  "epssPercentile": 0.02326,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "mongo-c-driver",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.23.1-1\u002Bdeb12u3",
      "fix": "DEBIAN-CVE-2026-6691",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-6691",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "mongo-c-driver",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.30.4-1\u002Bdeb13u2",
      "fix": "DEBIAN-CVE-2026-6691",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-6691",
      "released": "2026-05-15T16:01:09Z"
    },
    {
      "platform": "linux",
      "product": "mongo-c-driver",
      "release": "Debian 14",
      "fixedVersion": "2.2.0-1",
      "fix": "DEBIAN-CVE-2026-6691",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-6691",
      "released": "2026-05-15T16:01:09Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}