CVE-2026-84968

Heap out-of-bounds read via corrupt nested BSON in field path error message

State: Published
Severity: 6.9 Medium
Published: Sep 3, 2026
Updated: Sep 4, 2026
Reserved: Sep 2, 2026

Description

An out-of-bounds read in the BSON decoding component of the MongoDB PHP driver may allow an unauthenticated party who supplies specially formed input to have a small amount of adjacent process memory copied into an error message that is returned to application code. This may result in unintended disclosure of limited memory contents.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N	mongodb
3.1	5.3 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N	mongodb

Weaknesses

CWE-125 Out-of-bounds Read

Affected Products

Product	Versions
PHP DriverMongoDB	1.15.0 to before 1.21.8Affected 2.0.0 to before 2.1.9Affected 2.2.0 to before 2.5.1Affected

References

https://jira.mongodb.org/browse/PHPC-2744

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