CVE-2026-6691
CVE-2026-6691 · MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 8.6 · High · EPSS 0.2% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
mongodb c driver
- Versions
- ≥ 2.1.0, ≤ 2.1.2: Affected (semver)
No fix published
mongo-c-driver Debian:12
- Versions
- 1.23.1-1
- 1.23.1-1+deb12u1
- 1.23.1-1+deb12u2
- Affected ranges
- ECOSYSTEM: < 1.23.1-1+deb12u3
Update to 1.23.1-1+deb12u3
mongo-c-driver Debian:13
- Versions
- 1.30.4-1
- 1.30.4-1+deb13u1
- Affected ranges
- ECOSYSTEM: < 1.30.4-1+deb13u2
Update to 1.30.4-1+deb13u2
mongo-c-driver Debian:14
- Versions
- 1.30.4-1
- 2.0.2-1
- 2.1.0-1
- 2.1.1-1
- 2.1.2-1
- Affected ranges
- ECOSYSTEM: < 2.2.0-1
Update to 2.2.0-1
mongo-c-driver Ubuntu:Pro:20.04:LTS
- Versions
- 1.15.0-1
- 1.15.1-1
- 1.15.2-1
- 1.16.0-1
- 1.16.1-1
- 1.16.1-1build1
- 1.16.1-1build2
- 1.16.1-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mongo-c-driver Ubuntu:Pro:22.04:LTS
- Versions
- 1.18.0-1
- 1.19.1-1
- 1.19.2-1
- 1.20.0-1
- 1.20.0-1build1
- 1.20.1-1
- 1.21.0-1
- 1.21.0-1build1
- 1.21.0-1ubuntu0.1~esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mongo-c-driver Ubuntu:Pro:24.04:LTS
- Versions
- 1.24.3-1
- 1.24.4-1
- 1.25.1-1
- 1.25.2-1
- 1.25.4-1
- 1.26.0-1
- 1.26.0-1.1ubuntu1
- 1.26.0-1.1ubuntu2
- 1.26.0-1.1ubuntu2+esm1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
mongo-c-driver Ubuntu:25.10
- Versions
- 1.30.2-1
- 1.30.4-1ubuntu1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published