CVE-2026-84964

Heap corruption via OCSP request double free from crafted multi-URL certificate in TLS client

State: Published
Severity: 8.2 High
Published: Sep 3, 2026
Updated: Sep 3, 2026
Reserved: Sep 2, 2026

Description

A double free in the OpenSSL-based TLS certificate revocation checking path of the MongoDB C Driver can be reached by a TLS endpoint that the client already trusts. During the handshake, specially formed certificate data can cause the same heap object to be released twice. An unauthenticated party acting as the trusted endpoint may cause the connecting client application to terminate unexpectedly.

Scores

CVSS	Score	Vector	Source
4.0	8.2 High	CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H	mongodb

Weaknesses

CWE-415 Double Free

Affected Products

Product	Versions
C DriverMongoDB	1.17.0 to before 1.30.9Affected 2.0.0 to before 2.5.2Affected

References

https://jira.mongodb.org/browse/CDRIVER-6409

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