CVE-2026-84969
CVE-2026-84969
A memory-handling error in the BSON-to-JSON conversion helpers of the MongoDB C Driver can write a small number of bytes past the end of a heap buffer when a binary field is encoded and the output is cut short at a caller-configured length limit. A party who supplies the document content, with no privileges on the application that links the driver, may cause a small amount of data outside the intended buffer to be altered.
Vulnerability class: Buffer Overflow
CVSS v3 metric
CVSS v3 base score 3.7 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N.
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-84969?
- CVE-2026-84969 is a low-severity vulnerability, classified under Out-of-bounds Write. CVSS score: 3.7/10. Published 2026-09-03.
- How severe is CVE-2026-84969?
- Low severity. CVSS v3 base score is 3.7 out of 10.