CVE-2026-9740 — Unbounded recursion in BSONColumn interleaved-reference causes pre-auth stack overflow

CVE-2026-9740

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

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
MongoDB / MongoDB Server	affected 8.3.0 before 8.3.3; affected 8.2.0 before 8.2.10; affected 8.0.0 before 8.0.24; affected 7.0.0 before 7.0.35

CWE

CWE-674

References

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

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.