CVE-2026-17544

Critical

Description

Attacker-provided inputs to bccomp() could lead to an out-of-bounds write with stack and heap corruption in PHP versions from 8.4.* before 8.4.24 and from 8.5.* before 8.5.9.

SeverityCritical

CVSS9.8

Exploit probability—

Product

Php

PublishedJul 30, 2026

First seenJul 30, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

php php8.4.24, 8.5.9 or later

Vendor advisories

github.com/php/php-src/security/advisories/GHSA-x692-q9x7-8c3f

Affected products

Product	Affected versions	Fixed in
php php	8.4.0 ≤ v < 8.4.24, 8.5.0 ≤ v < 8.5.9	8.4.24, 8.5.9

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