CVE-2026-6691 — MongoDB C Driver Cyrus SASL Canonicalization Buffer Overflow
The MongoDB C Driver's Cyrus SASL integration performs unsafe string copying during username canonicalization, enabling a heap buffer overflow before any authentication or netwo…
Published: 2026-05-06 · CVSS: 8.6 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7