CVE-2026-84969: CWE-787: Out-of-bounds Write in MongoDB C Driver
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.
CVE-2026-84969: CWE-787: Out-of-bounds Write in MongoDB C Driver
Description
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.
CVSS v4.0
Score 6.3medium
Affected software
Weaknesses
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mongodb
- Date Reserved
- 2026-09-02T17:58:52.742Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a998d5bacd9273b4916fcaa
Added to database: 09/03/2026, 15:08:11 UTC
Last updated: 09/03/2026, 19:01:37 UTC
Views: 7
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