CVE-2026-104005
Incorrect authorization in MongoDB Server router for bulk writes to system namespaces
Published Oct 13, 2026 · updated Oct 15, 2026 · MongoDB MongoDB Server
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.
Code
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No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · CIRCL Vulnerability Lookup
Detected
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 o
Oct 15, 2026 · CIRCL Vulnerability Lookup
Updated
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 o
Affected
- vendor MongoDB MongoDB Serverversion unspecified
Sources
- CIRCL Vulnerability LookupVulnerability recordCVE-2026-104005
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 pr
vulnerability.circl.lu - CVE.orgVulnerability recordCVE-2026-104005
Official CVE identifier
cve.org