CVE-2026-7259
MEDIUMNull pointer dereference in php_mb_check_encoding() via mb_ereg_search_init()
Title source: cnaDescription
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, a mismatch between encoding lists in Oniguruma and mbfl leads to a NULL pointer dereference, resulting in a segmentation fault and denial of service. The vulnerability is exploitable when user-controlled input can influence the encoding passed to mb_regex_encoding().
References (1)
Core 1
Core References
Vendor Advisory vendor-advisory
https://github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75
Scores
CVSS v3
6.5
EPSS
0.0005
EPSS Percentile
16.4%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-476
Status
published
Products (5)
php/php
8.2.0 - 8.2.31
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