CVE-2026-6811 PUBLISHED

PHP Stack Exhaustion

Assigner: mongodb
Reserved: 21.04.2026 Published: 14.05.2026 Updated: 14.05.2026

Stack exhaustion vulnerability in the MongoDB PHP driver can cause application crashes when processing deeply nested BSON documents in unusual circumstances when the source of these BSON documents is not MongoDB Server.

CVSS Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	High	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	Passive

CVSS 4.0

CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 5.9

Attack Vector	Network	Scope	Unchanged
Attack Complexity	High	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

Product Status

Vendor	MongoDB Inc.
Product	PHP Driver
Versions	Default: unaffected Version 1.21.5 is affected Version 2.1.8 is affected

References

https://jira.mongodb.org/browse/PHPC-2636

Problem Types

CWE-674 Uncontrolled Recursion CWE

Impacts

CAPEC-230 Serialized Data with Nested Payloads