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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.

PUBLISHED Reserved 2026-05-27 | Published 2026-06-09 | Updated 2026-06-10 | Assigner mongodb




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-674 Uncontrolled Recursion

Product status

Default status
unaffected

8.3.0 (custom) before 8.3.3
affected

8.2.0 (custom) before 8.2.10
affected

8.0.0 (custom) before 8.0.24
affected

7.0.0 (custom) before 7.0.35
affected

References

jira.mongodb.org/browse/SERVER-125063

cve.org (CVE-2026-9740)

nvd.nist.gov (CVE-2026-9740)

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