What’s Vulnerable › Vulnerabilities
CVE-2026-104005: Incorrect authorization in MongoDB Server router for bulk writes to system namespaces
- Severity: medium (CVSS 6.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-13 · updated 2026-10-15
- Weakness: CWE-617
Description
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 products
- MongoDB: from 8.3.0 before 8.3.13; from 9.0 before 9.0.4 — fixed in 8.3.13, 9.0.4
How to fix
Upgrade to a fixed version: MongoDB 8.3.13, 9.0.4. Check the vendor advisory for mitigations.
References
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