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CVE-2026-6691

8.6 high SSVC exploitation: none Analyzed
NVD · CVE.org

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.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 8.6 · mongodbNVD modified 2026-10-26 19:10

Affected (CPE criteria) 1

  • cpe:2.3:a:mongodb:c_driver:*:*:*:*:*:mongodb:*:*

References 1