Heap-based buffer overflow in MongoDB driver for C - CVE-2026-106431

CSH
CYBERSECURITY HELP
Sign In REGISTER
 
Main Vulnerability Database Vulnerabilities #VU157653

Heap-based buffer overflow in MongoDB driver for C - CVE-2026-106431

Published: October 25, 2026


Vulnerability identifier: #VU157653
CSH Severity: Medium
CVSS v4: 8.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-106431
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to corrupt adjacent process memory or cause a denial of service.

The vulnerability exists due to a one-byte heap-based buffer overflow caused by an off-by-one error in the MongoDB C Driver BSON bulk document writer when serializing documents that end at a specific buffer boundary. A remote attacker can influence the size of documents serialized by an embedding application using the BSON bulk-writer API to cause a zero byte to be written immediately past a heap allocation, corrupting adjacent process memory or terminating the process.


Affected software

MongoDB driver for C
Fedora
mongo-c-driver

How to mitigate CVE-2026-106431

Install security update from vendor's website.

MongoDB driver for C - addressed in versions 1.30.13, 2.5.6
mongo-c-driver - addressed in versions 1.30.13-1.el8, 1.30.13-1.el9, 1.30.13-1.el10_2, 1.30.13-1.fc43, 1.30.13-1.fc44, 2.5.6-1.el10_3, 2.5.6-1.el10_4, 2.5.6-1.fc45

External References

Related Security Bulletins