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TI-2026-69712 Aliases CVE-2026-106434

Unrecognized payload accepted as plaintext in libmongocrypt decryption

Priority LOW 23CWE-354Published · 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

MongoDB libmongocrypt versions from 1.5.0 before 1.20.5 have an improper validation of integrity check value flaw (CWE-354) in explicit decryption. When the component receives an unrecognized encrypted payload, it returns the bytes unchanged instead of a decryption error. An actor who can modify stored encrypted fields, such as a database writer, a server, or a network intermediary, can make an affected application treat the supplied bytes as decrypted plaintext. CVSS 4.0 rates this MEDIUM (5.3); CISA has not added it to KEV and no exploitation is recorded.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

The explicit decryption component of MongoDB libmongocrypt can return an unrecognized encrypted payload unchanged instead of returning a decryption error. An actor who can modify stored encrypted fields, such as a database writer, server, or network intermediary, can cause an affected application to process the supplied bytes as decrypted plaintext.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00112 1st percentileScored 2026-11-07
Fix Fixed libmongocrypt (MongoDB): 1.20.5

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
MongoDBlibmongocrypt1.5.0 to before 1.20.51.20.5Patch availableCNA
  • libmongocrypt VendorMongoDB Affected 1.5.0 to before 1.20.5 Fixed in 1.20.5 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 1.20.5 or later. Red Hat lists one product as not affected.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

  • Fix · CNA libmongocrypt (MongoDB) Fixed in 1.20.5

Fixed in the same release

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

  • Release ·

    MongoDB libmongocrypt 1.20.5

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2026-69711 Memory corruption in MongoDB libmongocrypt with duplicate masterKeyPriority LOW 39
    • TI-2026-69708 Denial of service in MongoDB libmongocrypt via malformed KMS endpointPriority LOW 31
    Show all 3 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-09 Threatist record created from CVE-2026-106434
  2. 2026-10-10 Affected versions changed · Red Hat
  3. 2026-10-10 CVSS score added · Red Hat

References

Other 1

  • 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