CVE-2026-9740
Description
MongoDB Server's BSON validation logic has a vulnerability allowing unauthenticated users to crash the mongod process via crafted messages.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
MongoDB Server's BSON validation logic has a vulnerability allowing unauthenticated users to crash the mongod process via crafted messages.
Vulnerability
A vulnerability exists in MongoDB Server's BSON validation logic, specifically in how it handles certain nested binary data structures. This allows uncontrolled mutual recursion between validation functions, where each re-entry resets internal depth tracking. This issue affects MongoDB Server versions that have not yet been patched.
Exploitation
An unauthenticated user can exploit this vulnerability by sending a specially crafted message to the MongoDB server. The message triggers the uncontrolled recursion in the BSON validator, leading to a crash of the mongod process.
Impact
Successful exploitation of this vulnerability results in a denial-of-service condition, causing the mongod process to crash. This makes the database unavailable to legitimate users.
Mitigation
This vulnerability has been fixed in MongoDB Server. The specific fixed version and release date are not detailed in the provided references, but the issue is marked as 'Fixed' in the Jira ticket [1]. Users are advised to update to a patched version of MongoDB Server as soon as it becomes available.
AI Insight generated on Jun 9, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.
Affected products
1Patches
0No patches discovered yet.
Vulnerability mechanics
No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.
References
1News mentions
0No linked articles in our index yet.