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TI-2026-56250 Aliases CVE-2026-81529

Connection-option injection via unescaped settings in the canonical MongoDB URL builder

Priority LOW 31CWE-88Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-88.

Summary

Improper neutralization of delimiters in connection-URL construction allows connection-option injection in the MongoDB C# Driver. When an application passes untrusted text into the driver's connection-URL builder and round-trips the builder back into a client configuration, the untrusted text is serialized without neutralizing the URL/option delimiters and is then re-parsed as authoritative connection options. A low-privileged user of such an application can thereby introduce or suppress security-relevant connection settings.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00285 21st percentileScored 2026-11-07
Fix Fixed C# Driver (MongoDB): 3.11.1

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
MongoDBC# Driver2.0.0 to before 3.11.13.11.1Patch availableCNA
  • C# Driver VendorMongoDB Affected 2.0.0 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-2026-56248 NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translationPriority LOW 36
    • 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-2026-81529

References

Advisory 1

Other 1

  • TI-2026-56248 NoSQL injection via unquoted constant GroupBy keys in LINQ pipeline translation CVSS 4.0MEDIUM 6.9
  • 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-2026-56251 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