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TI-2026-56248 Aliases CVE-2026-81527GHSA-qvhj-5652-cjrg

NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation

Priority LOW 36CWE-943Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

A NoSQL/expression injection weakness exists in the LINQ-to-aggregation query translation layer of the MongoDB C# Driver, in both aggregation expression and query filter translation. When application-supplied values are embedded in certain query constructs, special elements contained within those values are not properly escaped before the resulting query is transmitted to the database, so portions of the value may be interpreted by the database as query logic rather than as data. A user able to supply values that an application incorporates into an affected query may thereby cause unintended data to be returned or query results to be altered.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Fix Fixed C# Driver (MongoDB): 3.11.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
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
MongoDBC# Driver2.14.0 to before 3.11.13.11.1Patch availableCNA
  • C# Driver VendorMongoDB Affected 2.14.0 to before 3.11.1 Fixed in 3.11.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:mongodb:*:*2.10.0 to before 3.11.1VulnerableMongoDB
  • cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:mongodb:*:* Versions 2.10.0 to before 3.11.1 Vulnerable ·MongoDB

Remediation

  • Fix · CNA C# Driver (MongoDB) Fixed in 3.11.1

Fixed in the same release

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

  • Release ·

    MongoDB C# Driver 3.11.1

    4 records Highest priority Priority LOW 4 LOW

    Other records, highest priority first

    • TI-2026-56250 Connection-option injection via unescaped settings in the canonical MongoDB URL builderPriority LOW 31
    • TI-2026-56251 KMS master key exposure via unredacted credential serialization in driver settings stringPriority LOW 29
    • TI-2026-56249 NoSQL injection via array replacement bypassing update shape validation in driver write pathPriority LOW 24
    Show all 4 records →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-81527
  2. 2026-10-03 Alias added: GHSA-qvhj-5652-cjrg

References

Advisory 1

Other 1

  • TI-2022-23899 Deserializing compromised object with MongoDB .NET/C# Driver may cause remote code execution CVSS 3.1HIGH 7.2
  • TI-2026-60051 Regular expression injection via unescaped characters in LINQ query translation in MongoDB C# Driver CVSS 4.0HIGH 7.1
  • TI-2026-56250 Connection-option injection via unescaped settings in the canonical MongoDB URL builder CVSS 4.0HIGH 7.1
  • TI-2026-56251 KMS master key exposure via unredacted credential serialization in driver settings string CVSS 4.0MEDIUM 6.8
  • TI-2026-60050 GridFS data disclosure and deletion via query-operator injection in file IDs in the MongoDB C# Driver CVSS 4.0MEDIUM 6.1
  • TI-2026-56249 NoSQL injection via array replacement bypassing update shape validation in driver write path CVSS 4.0MEDIUM 5.3
See all 7 →

Sources

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