Read the docs
TI-2026-71816 Aliases CVE-2026-96299GHSA-ppm2-9qg4-qq47

Missing authorization check in MongoDB mongos enables denial of service

Priority LOW 31CWE-617Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-617.

Summary

MongoDB Server from 8.3.0 before 8.3.13 and from 9.0 before 9.0.4 is affected. An internal aggregation stage in mongos, the sharded cluster router, lacks authorization checks, so a subsequent stage can be forced to run on the router in a state it was not designed to handle (CWE-617). An authenticated user with readWrite privileges can craft an aggregation pipeline that triggers an unhandled fatal error, aborting the mongos process and denying service to all clients routed through it.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

Description from the 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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00235 14th percentileScored 2026-11-07
Fix Fixed MongoDB Server (MongoDB): 8.3.13, 9.0.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MongoDBMongoDB Server8.3.0 to before 8.3.13; 9.0 to before 9.0.48.3.13, 9.0.4Patch availableCNA
  • MongoDB Server VendorMongoDB Affected 8.3.0 to before 8.3.13; 9.0 to before 9.0.4 Fixed in 8.3.13, 9.0.4 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:*——MongoDB
  • cpe:2.3:a:mongodb:mongodb:*:*:*:*:*:*:*:* Versions — — ·MongoDB

Remediation

Upgrade MongoDB Server to 8.3.13 or 9.0.4, which fix the issue.

Written with Claude Haiku 5.5 from the sources below · 2026-10-27

  • Fix · CNA MongoDB Server (MongoDB) Fixed in 8.3.13, 9.0.4

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    MongoDB Server 8.3.13, 9.0.4

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-71837 Denial of service in MongoDB Server mongos via crafted pipelinePriority LOW 31
    Show all 2 records →

Timeline

  1. 2026-10-13 Threatist record created from CVE-2026-96299
  2. 2026-10-13 Title updated · CNA
  3. 2026-10-13 Weakness changed · CNA
  4. 2026-10-13 CISA SSVC decision points changed
  5. 2026-10-13 Priority changed: MEDIUM → LOW
  6. 2026-10-13 Alias added: GHSA-ppm2-9qg4-qq47

References

Other 1

  • TI-2019-08023 Code injection in mongo-express KEVCVSS 3.1CRITICAL 9.9
  • TI-2025-13542 Zlib compressed protocol header length confusion may allow memory read KEVCVSS 4.0HIGH 8.7
  • TI-2026-79432 BSON output corruption via out-of-range binary subtype in MongoDB C# Driver CVSS 4.0MEDIUM 6.9
  • TI-2026-79424 NoSQL command injection via mismatched BSON length in MongoDB C# Driver CVSS 4.0MEDIUM 6.9
  • TI-2026-79422 Unbounded memory growth in MongoDB C# Driver BSON deserialization CVSS 4.0HIGH 8.2
  • TI-2026-79427 Authentication bypass via issuer-and-serial-only certificate equality CVSS 4.0HIGH 7.6
See all 376 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences