CVE-2026-96299 — Missing Authorization Check on Internal Aggregation Stage in MongoDB Server mongos Leads to Denial of Service

Description (CNA)

A security issue was discovered in MongoDB mongos (the sharded cluster router) where an authenticated user with readWrite privileges could crash the mongos process by crafting a specially formed aggregation pipeline. The issue leverages an internal aggregation stage that lacks proper authorization checks despite being intended for internal use, allowing a subsequent stage to be forced to execute on the router under conditions it was not designed to handle. This results in an unhandled fatal error that causes the mongos process to immediately abort, resulting in denial of service for all clients routed through the affected mongos instance.

Affected (CNA)

Vendor / product	Versions
MongoDB / MongoDB Server	affected 8.3.0 before 8.3.13; affected 9.0 before 9.0.4

CWE

CWE-617

References

https://jira.mongodb.org/browse/SERVER-130431

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.