CVE-2026-106432 MongoDB CVE debrief

Who should care

Defenders responsible for maintaining and securing applications using MongoDB PHP Driver, especially those using affected versions, should assess exposure and prioritize updates. This includes reviewing and adjusting runtime configurations to prevent multi-gigabyte values and monitoring applications using affected versions of MongoDB PHP Driver.

Why it matters

CVE-2026-106432 is a heap buffer overflow vulnerability in the MongoDB PHP Driver that can lead to memory corruption or PHP process termination. Defenders should prioritize verifying and updating to the latest version, especially for applications using affected versions.

• Memory corruption or PHP process termination due to heap buffer overflow
• Potential for denial-of-service (DoS) attacks
• Need for verification of affected versions and runtime configurations
• Priority for updating to the latest version of MongoDB PHP Driver

Technical summary

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. The vulnerability details are based on the CVE Program record and the source item from cve_program_cvelist_v5.

Defensive priority

Defenders should prioritize verifying and updating to the latest version of MongoDB PHP Driver, especially for applications using affected versions.

Recommended defensive actions

• Verify and update to the latest version of MongoDB PHP Driver
• Review and adjust runtime configurations to prevent multi-gigabyte values
• Monitor applications using affected versions of MongoDB PHP Driver
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.

Evidence notes

The vulnerability details are based on the CVE Program record and the source item from cve_program_cvelist_v5. The affected versions of MongoDB PHP Driver are 1.16.0 to 1.21.11, 2.0.0 to 2.1.11, and 2.2.0 to 2.5.4.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.