Vulnerability in MongoDB PHP Driver

CVE-2026-106436

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-106436?
CVE-2026-106436 is a medium-severity vulnerability in MongoDB PHP Driver, classified under CWE-252. CVSS score: 4.8/10. Published 2026-10-08.
How severe is CVE-2026-106436?
Medium severity. CVSS v3 base score is 4.8 out of 10.