CVE-2026-106432: php driver — Fix

Description

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.

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CVSS v3.1 Score

3.6

LOW

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L

EPSS — Exploit Prediction

0.0017

Probability of exploitation

0.06%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-681 CWE-681

Affected Products

Vendor	Product	Versions
mongodb	php_driver	1.3.0 — 1.21.1
mongodb	php_driver	2.0.0 — 2.1.11
mongodb	php_driver	2.2.0 — 2.5.4

References

Advisories & Patches

https://jira.mongodb.org/browse/PHPC-2741

Frequently Asked Questions

What is CVE-2026-106432? +

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. It has a CVSS v3.1 base score of 3.6 (LOW).

How severe is CVE-2026-106432? +

CVE-2026-106432 has a CVSS v3.1 score of 3.6 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0017, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-106432? +

CVE-2026-106432 affects products from mongodb, specifically: php_driver. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-106432? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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