CVE-2026-7259

Medium

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, 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().

SeverityMedium

CVSS6.5

Exploit probability—

Product

Php

PublishedMay 10, 2026

First seenMay 10, 2026

Weakness typeCWE-476NULL pointer dereference

How to fix

Update

php php8.2.31, 8.3.31, 8.4.21, 8.5.6 or later

Vendor advisories

github.com/php/php-src/security/advisories/GHSA-wm6j-2649-pv75

Affected products

Product	Affected versions	Fixed in
php php	8.2.0 ≤ v < 8.2.31, 8.3.0 ≤ v < 8.3.31, 8.4.0 ≤ v < 8.4.21, 8.5.0 ≤ v < 8.5.6	8.2.31, 8.3.31, 8.4.21, 8.5.6

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