High severity · published May 14, 2026
CVE-2026-6811
PHP Stack Exhaustion
7.5
CVSS
0.4%
EPSS
No
On KEV
Description
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 30% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PD
PHP Driver · MongoDB Inc.
1.21.5; 2.1.8 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-6811
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-6811
Vendor Advisory
https://jira.mongodb.org/browse/PHPC-2636
More from PHP Driver
7.5
CVE-2026-112368
Unbounded Recursion in phongo_bson_visit_document/visit_array: