UpHeron
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Servers and applications

CVE-2026-9740

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.

Severity
High 8.7
Published
9 Jun 2026
Last changed
23 Jul 2026
Added to UpHeron
21 Oct 2026
Fixed in
7.0.35, 8.0.24, 8.2.10, 8.3.3
Sources
NVD

Affected software

SoftwareAffected versions
MongoDBServers and applications · cpe:a:mongodb:mongodb
  • From 7.0.0 before 7.0.35
  • From 8.0.0 before 8.0.24
  • From 8.2.0 before 8.2.10
  • From 8.3.0 before 8.3.3

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2026-9740
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2026-9740