CVE-2026-9740

Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow

State: Published
Severity: 8.7 High
Published: Jun 9, 2026
Updated: Jun 10, 2026
Reserved: May 27, 2026

Description

A vulnerability in MongoDB Server's BSON validation logic allows an unauthenticated user to crash the mongod process by sending a specially crafted message. The BSON validator's handling of certain nested binary data structures permits uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N	mongodb
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	mongodb

Weaknesses

CWE-674 Uncontrolled Recursion

Affected Products

Product	Versions
MongoDB ServerMongoDB	8.3.0 to before 8.3.3Affected 8.2.0 to before 8.2.10Affected 8.0.0 to before 8.0.24Affected 7.0.0 to before 7.0.35Affected

References

https://jira.mongodb.org/browse/SERVER-125063

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