Description
In PHP versions 8.2.* before 8.2.31, 8.3.* before 8.3.31, 8.4.* before 8.4.21, and 8.5.* before 8.5.6, some functions, including urldecode(), pass signed char to ctype functions (like isxdigit()). On the systems with default signed char and optimized table-lookup ctype functions - such as NetBSD - this can lead to accessing array with negative offset, which can trigger a denial of service.
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4
Scores
CVSS v3
7.5
EPSS
0.0002
EPSS Percentile
6.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (5)
php/php
8.2.0 - 8.2.21
PHP Group/PHP
8.2.* - 8.2.31
PHP Group/PHP
8.3.* - 8.3.31
PHP Group/PHP
8.4.* - 8.4.21
PHP Group/PHP
8.5.* - 8.5.6
Published
May 10, 2026
Tracked Since
May 10, 2026