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Severe, 6 weeks1496Projects326

1496 severe, 6 weeks · 326 projects

MongoDBGHSA-fw3j-wh78-34mj

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

MongoDB

CVE-2026-84964 · Published Sep 3, 2026

High8.2
Fix: upgrade to 1.30.9 or later (2 fixed versions below)
GitHub advisory

Impact

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.

Patches

Fixed in 1.30.9 and 2.5.2.

Workarounds

Use OCSP stapling.

References

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

Affected versions

PackageAffectedFixed in
MongoDB C Driver
Product
>= 1.17.0, < 1.30.91.30.9
>= 2.0.0, < 2.5.22.5.2
Details and references
CVSS 4.0
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
Severity from
GitHub (reviewed advisory)

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