CVE-2026-106432
Heap buffer overflow via 32-bit string-length truncation in MongoDB PHP Driver
MongoDB PHP DriverRuntimes & languagesCVSS
2.0LowExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.17%Chance of exploitation activity in the next 30 days, higher than 6% of CVEs. Scored 23 Oct 2026FIRST EPSS
What fixes it
A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.
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.
Text from CVE List
Affected versions 3
- PHP Driveraffected: 1.16.0 before 1.21.11CVE List
- PHP Driveraffected: 2.0.0 before 2.1.11CVE List
- PHP Driveraffected: 2.2.0 before 2.5.4CVE List