high7.8
CVE-2026-6691
The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authe…
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Mongodb | C Driver | from 2.1.0 before 2.1.2 |