vulnerability
PHP Vulnerability: CVE-2025-6491
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:N/AC:M/Au:N/C:N/I:N/A:C) | Feb 17, 2026 | Feb 17, 2026 | Mar 30, 2026 |
Severity
7
CVSS
(AV:N/AC:M/Au:N/C:N/I:N/A:C)
Published
Feb 17, 2026
Added
Feb 17, 2026
Modified
Mar 30, 2026
Description
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.
Solutions
php-upgrade-8_1_33php-upgrade-8_2_29php-upgrade-8_3_23php-upgrade-8_4_10
Rapid7 Labs
2026 Global Threat Landscape Report
The predictive window has collapsed. Exploitation follows disclosure in days. See how attackers are accelerating and how to stay ahead.