Vulnerability in MongoDB PHP Driver

[ Description ]Official 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.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund8 Oct 2026WID-SEC-2026-3830

  MongoDB Treiber: Multiple vulnerabilities Translated from German

  CVE-2026-106435CVE-2026-106434CVE-2026-106429+10 more CVEs

[ References ]References

• jira.mongodb.org/browse/PHPC-2739Vendor AdvisoryIssue Tracking