CVE-2026-96746

EUVD-2026-86263
An out-of-bounds write in the connection-monitoring logic of the MongoDB C Driver may allow an unauthenticated party who controls name resolution and the responses of the hosts named in a client's connection string to write beyond the end of a heap buffer. This may cause the application using the driver to terminate unexpectedly.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mongodbCNA
6.5 MEDIUM
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mongodbc_driver
𝑥
< 1.30.12
CNA
mongodbc_driver
2.0.0 ≤
𝑥
< 2.5.5
CNA
Common Weakness Enumeration
References
https://github.com/mongodb/mongo-c-driver/releases/tag/1.30.12
https://github.com/mongodb/mongo-c-driver/releases/tag/2.5.5
https://github.com/mongodb/mongo-c-driver/security/advisories/GHSA-frjf-h5jg-4v46