Skip to content
Heist/ feed
UnratedFix available

DEBIAN-CVE-2026-6691

Type: advisorySource: OSV1 source record

The MongoDB C Driver's 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.

Announced Group revision 1
Original source ↗

DEBIAN-CVE-2026-6691

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-6691

mongo-c-driver

Source reference: /affected/0/package/name

Affected versions
1.23.1-1

Source reference: /affected/0/versions

1.23.1-1+deb12u1

Source reference: /affected/0/versions

1.23.1-1+deb12u2

Source reference: /affected/0/versions

Fixed versions
1.23.1-1+deb12u3

Source reference: /affected/0/ranges

Prerequisites
Not stated in this record

mongo-c-driver

Source reference: /affected/1/package/name

Affected versions
1.30.4-1

Source reference: /affected/1/versions

1.30.4-1+deb13u1

Source reference: /affected/1/versions

Fixed versions
1.30.4-1+deb13u2

Source reference: /affected/1/ranges

Prerequisites
Not stated in this record

mongo-c-driver

Source reference: /affected/2/package/name

Affected versions
1.30.4-1

Source reference: /affected/2/versions

2.0.2-1

Source reference: /affected/2/versions

2.1.0-1

Source reference: /affected/2/versions

2.1.1-1

Source reference: /affected/2/versions

2.1.2-1

Source reference: /affected/2/versions

Fixed versions
2.2.0-1

Source reference: /affected/2/ranges

Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.23.1-1+deb12u3"
          }
        ]
      }
    ],
    "package": {
      "name": "mongo-c-driver",
      "purl": "pkg:deb/debian/mongo-c-driver?arch=source&distro=bookworm",
      "ecosystem": "Debian:12"
    },
    "versions": [
      "1.23.1-1",
      "1.23.1-1+deb12u1",
      "1.23.1-1+deb12u2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6691.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.30.4-1+deb13u2"
          }
        ]
      }
    ],
    "package": {
      "name": "mongo-c-driver",
      "purl": "pkg:deb/debian/mongo-c-driver?arch=source&distro=trixie",
      "ecosystem": "Debian:13"
    },
    "versions": [
      "1.30.4-1",
      "1.30.4-1+deb13u1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6691.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "2.2.0-1"
          }
        ]
      }
    ],
    "package": {
      "name": "mongo-c-driver",
      "purl": "pkg:deb/debian/mongo-c-driver?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "1.30.4-1",
      "2.0.2-1",
      "2.1.0-1",
      "2.1.1-1",
      "2.1.2-1"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6691.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#58148 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. DEBIAN-CVE-2026-6691 · Revision 1Source updated