CVE-2025-6491
Published:July 13, 2025
Updated:June 07, 2026
In PHP versions:8.1.* before 8.1.33, 8.2.* before 8.2.29, 8.3.* before 8.3.23, 8.4.* before 8.4.10 when parsing XML data in SOAP extensions, overly large (>2Gb) XML namespace prefix may lead to null pointer dereference. This may lead to crashes and affect the availability of the target server.
Affected Packages
https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.2.0RC1 <php-8.2.29Fix Suggestion:
Update to version php-8.2.29https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.4.0RC1 <php-8.4.10Fix Suggestion:
Update to version php-8.4.10https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-4.0.0 <php-8.1.33Fix Suggestion:
Update to version php-8.1.33https://github.com/php/php-src.git (GITHUB):
Affected version(s) >=php-8.3.0RC1 <php-8.3.23Fix Suggestion:
Update to version php-8.3.23Related Resources (4)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.2
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
5.9
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
NULL Pointer Dereference
EPSS
Base Score:
0.77