CVE-2026-96746GHSA-frjf-h5jg-4v46
C Driver: Heap buffer overflow via mid-scan command list growth in client topology monitoring
MongoDB C DriverDatabasesCVSS
8.3HighExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.37%Chance of exploitation activity in the next 30 days, higher than 29% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
Description
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.
Text from CVE List
Affected versions 2
- C Driveraffected: all versions before 1.30.12CVE List
- C Driveraffected: 2.0.0 before 2.5.5CVE List