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TI-2026-69733 Aliases CVE-2026-106436

Unchecked BSON encoder return values in MongoDB PHP Driver

Priority LOW 28CWE-252Published · Updated

Key facts

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

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

Summary

The BSON encoder in MongoDB PHP Driver from 1.3.0 before 1.21.11, from 2.0.0 before 2.1.11, and from 2.2.0 before 2.5.4 does not check some return values after a document exceeds libbson's size limit (CWE-252). This leaves the encoder in an invalid state. An unauthenticated remote attacker who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.

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

Description from the CNA

The BSON encoder in the MongoDB PHP Driver does not check some return values after a document exceeds libbson's size limit. This can leave the encoder in an invalid state. An unauthenticated actor who can cause an affected application to encode an unusually large data structure can terminate the PHP worker or cause the resulting document to omit fields. No MongoDB server connection or database authentication is required.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00256 17th percentileScored 2026-11-07
Fix Fixed PHP Driver (MongoDB): 1.21.11, 2.1.11, 2.5.4

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
MongoDBPHP Driver1.3.0 to before 1.21.11; 2.0.0 to before 2.1.11; 2.2.0 to before 2.5.41.21.11, 2.1.11, 2.5.4Patch availableCNA
  • PHP Driver VendorMongoDB Affected 1.3.0 to before 1.21.11; 2.0.0 to before 2.1.11; 2.2.0 to before 2.5.4 Fixed in 1.21.11, 2.1.11, 2.5.4 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mongodb:php_driver:*:*:*:*:*:mongodb:*:*1.3.0 to before 1.21.1; 2.0.0 to before 2.1.11; 2.2.0 to before 2.5.4VulnerableMongoDB
  • cpe:2.3:a:mongodb:php_driver:*:*:*:*:*:mongodb:*:* Versions 1.3.0 to before 1.21.1; 2.0.0 to before 2.1.11; 2.2.0 to before 2.5.4 Vulnerable ·MongoDB

Remediation

The fixed versions of MongoDB PHP Driver are 1.21.11, 2.1.11 and 2.5.4.

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

  • Fix · CNA PHP Driver (MongoDB) Fixed in 1.21.11, 2.1.11, 2.5.4

Fixed in the same release

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

  • Release ·

    MongoDB PHP Driver 1.21.11, 2.1.11, 2.5.4

    2 records Highest priority Priority LOW 2 LOW

    Other records, highest priority first

    • TI-2026-69732 Heap buffer overflow in MongoDB PHP Driver BSON encoderPriority LOW 10
    Show all 2 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-2026-106436
  2. 2026-10-13 CVSS score added · NVD

References

Advisory 1

  • TI-2026-56246 Cross-tenant database retargeting via dot/NUL injection in namespace strings in the PHP Driver CVSS 4.0HIGH 8.6
  • TI-2026-58391 Heap out-of-bounds read via corrupt nested BSON in field path error message CVSS 4.0MEDIUM 6.9
  • TI-2024-07001 Accessing Untrusted Directory May Allow Local Privilege Escalation CVSS 3.1HIGH 7.8
  • TI-2021-12015 Information disclosure in MongoDB C Driver CVSS 3.1HIGH 7.5
  • TI-2025-11114 Bulk write with options may read invalid memory CVSS 4.0MEDIUM 6.9
  • TI-2026-05975 PHP Stack Exhaustion CVSS 4.0MEDIUM 6.0
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences