Integer overflow in MongoDB driver for C - CVE-2026-84965

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Main Vulnerability Database Vulnerabilities #VU147246

Integer overflow in MongoDB driver for C - CVE-2026-84965

Published: September 7, 2026


Vulnerability identifier: #VU147246
CSH Severity: Low
CVSS v4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-84965
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to an integer overflow in the BSON library\'s JSON parsing code when parsing a sufficiently large JSON input. A remote attacker can supply a sufficiently large JSON input to cause a denial of service.

Only builds where sizes are 32 bits are affected.


Affected software

MongoDB driver for C
Fedora
mongo-c-driver

How to mitigate CVE-2026-84965

Install security update from vendor's website.

MongoDB driver for C - addressed in versions 1.30.9, 2.5.2
mongo-c-driver - addressed in versions 1.30.9-1.el8, 1.30.9-1.el9, 1.30.9-1.el10_2, 1.30.9-1.fc43, 1.30.9-1.fc44, 2.5.2-1.el10_3, 2.5.2-1.el10_4, 2.5.2-1.fc45

External References

Related Security Bulletins