CVE-2026-96299 — Missing Authorization Check on Internal Aggregation Stage in MongoDB Server mongos Leads to Denial of Service
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…
Published: 2026-10-13 · CVSS: 7.1 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7