Read the docs
TI-2026-69732 Aliases CVE-2026-106432

Heap buffer overflow in MongoDB PHP Driver BSON encoder

Priority LOW 10CWE-681Published · Updated

Key facts

Attack vector
Local
Privileges required
Low
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

MongoDB PHP Driver versions from 1.16.0 before 1.21.11, from 2.0.0 before 2.1.11, and from 2.2.0 before 2.5.4 are affected. The BSON encoder converts a string length to a 32-bit value without validation (CWE-681), so the allocation size can wrap while the copy uses the original length. A local user with low privileges can trigger a heap buffer overflow when an affected application encodes a string near 4 GiB under a non-default runtime configuration that permits multi-gigabyte values. The overflow can corrupt process memory or terminate the PHP process, and no MongoDB server interaction 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 converts a string length to a 32-bit value without validation. When an affected application encodes a string near 4 GiB, the allocation size can wrap while the copy operation uses the original length. The resulting heap buffer overflow can corrupt process memory or terminate the PHP process. Reaching this issue requires a non-default runtime configuration that permits multi-gigabyte values. No MongoDB server interaction is required.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0017 6th 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 Driver1.16.0 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 1.16.0 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

Upgrade MongoDB PHP Driver to version 1.21.11, 2.1.11 or 2.5.4, depending on the release branch in use.

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-2026-69733 Unchecked BSON encoder return values in MongoDB PHP DriverPriority LOW 28
    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-2026-106432
  2. 2026-10-10 Affected versions changed · Red Hat
  3. 2026-10-10 CVSS score added · Red Hat
  4. 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-2026-69733 Unchecked BSON encoder return values in MongoDB PHP Driver CVSS 4.0MEDIUM 6.3
See all 7 →

Sources

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