CVE-2026-106436
Application denial of service and data truncation via unchecked BSON append failures in MongoDB PHP Driver
MongoDB PHP DriverRuntimes & languagesCVSS
6.3MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.26%Chance of exploitation activity in the next 30 days, higher than 16% 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 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.
Text from CVE List
Affected versions 3
- PHP Driveraffected: 1.3.0 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