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TI-2026-79425 Aliases CVE-2026-114647

MongoDB C# Driver NoSQL operator injection in findOneAndReplace

Priority MEDIUM 57CWE-943Published · Updated

Key facts

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

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

Summary

The MongoDB C# Driver does not reject replacement documents whose top-level field names begin with a dollar sign in FindOneAndReplace, unlike other replace operations. An application that builds such a document from user-supplied field names can cause the server to apply update operators instead of a full replacement. The effect is limited to the document matched by the application's own filter, whose contents can be modified in ways the application did not intend. CISA's SSVC rates exploitation as PoC, automatable as no, and technical impact as partial.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

The MongoDB C# Driver does not reject replacement documents whose top-level field names begin with a dollar sign in FindOneAndReplace, unlike other replace operations. An application that builds such a document from user-supplied field names can have the server apply update operators instead of a full replacement. The effect is limited to the document matched by the application's own filter, whose contents can be modified in ways the application did not intend.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Fix Fixed C# Driver (MongoDB): 3.13.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
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# Driver2.13.0 to before 3.13.03.13.0Patch availableCNA
  • C# Driver VendorMongoDB Affected 2.13.0 to before 3.13.0 Fixed in 3.13.0 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:c\#_driver:*:*:*:*:*:*:*:*——MongoDB
  • cpe:2.3:a:mongodb:c\#_driver:*:*:*:*:*:*:*:* Versions — — ·MongoDB

Remediation

Upgrade the MongoDB C# Driver to version 3.13.0 or later. Affected versions are 2.13.0 up to but not including 3.13.0.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

  • Fix · CNA C# Driver (MongoDB) Fixed in 3.13.0

Fixed in the same release

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

  • Release ·

    MongoDB C# Driver 3.13.0

    11 records Highest priority Priority HIGH 5 HIGH, 6 MEDIUM

    Other records, highest priority first

    • TI-2026-79432 BSON output corruption via out-of-range binary subtype in MongoDB C# DriverPriority HIGH 70
    • TI-2026-79424 NoSQL command injection via mismatched BSON length in MongoDB C# DriverPriority HIGH 70
    • TI-2026-79422 Unbounded memory growth in MongoDB C# Driver BSON deserializationPriority HIGH 69
    Show all 11 records →

Timeline

  1. 2026-10-22 Threatist record created from CVE-2026-114647
  2. 2026-10-23 1 new reference · CNA
  3. 2026-11-02 CISA SSVC decision points changed
  4. 2026-11-02 Priority changed: LOW → MEDIUM

References

Other 3

  • 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