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TI-2026-79433 Aliases CVE-2026-114655

KMS request injection in MongoDB libmongocrypt

Priority LOW 26CWE-74Published · Updated

Key facts

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

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

Summary

MongoDB libmongocrypt from 1.0.0 before 1.21.1 inserts values from key vault documents, KMS configuration and KMS responses into requests to AWS, Azure and GCP key management services without validating or encoding them (CWE-74). A user with write access to the key vault collection can alter these requests, including token claims that the library signs with the application's credentials. Key management operations may then run with parameters the application did not intend.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

Description from the CNA

libmongocrypt builds requests to external key management services (AWS, Azure and GCP) by inserting values from key vault documents, KMS provider configuration and KMS responses into request lines, headers and signed request bodies without validating or encoding them for each context. A user with write access to the key vault collection can alter the structure of these requests, including adding members to request bodies and token claims that the library then signs with the application's credentials. This may result in key management operations being performed with parameters the application did not intend.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00267 18th percentileScored 2026-11-07
Fix Fixed libmongocrypt (MongoDB): 1.21.1

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
MongoDBlibmongocrypt1.0.0 to before 1.21.11.21.1Patch availableCNA
  • libmongocrypt VendorMongoDB Affected 1.0.0 to before 1.21.1 Fixed in 1.21.1 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:libmongocrypt:*:*:*:*:*:*:*:*——MongoDB
  • cpe:2.3:a:mongodb:libmongocrypt:*:*:*:*:*:*:*:* Versions — — ·MongoDB

Remediation

Upgrade MongoDB libmongocrypt to version 1.21.1, which fixes the flaw.

Written with Claude Haiku 5.5 from the sources below · 2026-10-30

  • Fix · CNA libmongocrypt (MongoDB) Fixed in 1.21.1

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-22 Threatist record created from CVE-2026-114655
  2. 2026-10-23 1 new reference · CNA
  3. 2026-10-23 Priority changed: MEDIUM → LOW
  4. 2026-10-29 Affected versions changed · Red Hat
  5. 2026-10-29 CVSS score added · Red Hat
  6. 2026-10-30 CISA SSVC decision points changed

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