CVE-2026-7258

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

Product

Php

PublishedMay 10, 2026

First seenMay 10, 2026

Weakness typeCWE-125Out-of-bounds read

How to fix

Update

php php8.2.21, 8.3.31, 8.4.21, 8.5.6 or later

Vendor advisories

github.com/php/php-src/security/advisories/GHSA-m8rr-4c36-8gq4

Affected products

Product	Affected versions	Fixed in
php php	8.2.0 ≤ v < 8.2.21, 8.3.0 ≤ v < 8.3.31, 8.4.0 ≤ v < 8.4.21, 8.5.0 ≤ v < 8.5.6	8.2.21, 8.3.31, 8.4.21, 8.5.6

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.