CVE-2024-6381: MongoDB C Driver bson_strfreev may be susceptible to integer overflow

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-07-02 · updated 2026-06-17
Weakness: CWE-680

Description

The bson_strfreev function in the MongoDB C driver library may be susceptible to an integer overflow where the function will try to free memory at a negative offset. This may result in memory corruption. This issue affected libbson versions prior to 1.26.2

Affected products

MongoDB Inc libbson: before 1.26.2 — fixed in 1.26.2

How to fix

Upgrade to a fixed version: MongoDB Inc libbson 1.26.2. Check the vendor advisory for mitigations.

References

https://jira.mongodb.org/browse/CDRIVER-5622
https://jira.mongodb.org/browse/CDRIVER-5622
https://lists.debian.org/debian-lts-announce/2025/05/msg00012.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00027.html

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