mongo-c-driver: The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabli...
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.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mongo-c-driver · Debian 12.15 (bookworm) | 1.23.1-1+deb12u3 | DEBIAN-CVE-2026-6691 | May 15, 2026 |
| mongo-c-driver · Debian 13.5 (trixie) | 1.30.4-1+deb13u2 | DEBIAN-CVE-2026-6691 | May 15, 2026 |
| mongo-c-driver · Debian 14 | 2.2.0-1 | DEBIAN-CVE-2026-6691 | May 15, 2026 |
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