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TI-2026-79426 Aliases CVE-2026-114648

NoSQL injection in MongoDB C# Driver LINQ filter field names

Priority HIGH 65CWE-943Published · Updated

Key facts

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

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

Summary

The MongoDB C# Driver from 2.14.0 before 3.13.0 does not neutralize dot and dollar characters in LINQ field paths (CWE-943). A low-privileged application user whose input reaches these paths can redirect queries or updates to fields the application did not name, exposing other users' documents. Certain values can also write malformed fields that make stored documents unreadable until repaired.

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

Description from the CNA

The MongoDB C# Driver does not neutralize dot and dollar characters in dictionary keys, field names and array-filter identifiers used in LINQ queries before placing them into the field paths it sends to the server. An application user whose input reaches these positions can redirect a query or update to fields the application did not name, which can expose other users' documents and widen updates beyond the intended data. Certain values can also write malformed fields that leave stored documents unreadable by the application until they are repaired.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00321 25th 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# Driver2.14.0 to before 3.13.03.13.0Patch availableCNA
  • C# Driver VendorMongoDB Affected 2.14.0 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

Update the MongoDB C# Driver to version 3.13.0, the fixed version.

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-2026-114648
  2. 2026-10-23 1 new reference · CNA
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-11-02 CISA SSVC decision points changed
  5. 2026-11-02 Priority changed: LOW → HIGH

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