Copyright © 2012 Red Hat, Inc. All rights reserved. Important 2026-07-30T11:22:24 php: PHP: Arbitrary code execution via out-of-bounds write in bccomp() 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CWE-787

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.

A flaw was found in PHP. A remote attacker could exploit this vulnerability by providing specially crafted inputs to the `bccomp()` function. This could lead to an out-of-bounds write, resulting in stack and heap corruption. Such memory corruption can enable arbitrary code execution, allowing the attacker to take control of the affected system.

This is an Important flaw in PHP that could lead to arbitrary code execution due to an out-of-bounds write in the `bccomp()` function. While exploitation requires high attack complexity, a successful attack could result in stack and heap corruption, potentially compromising the system. This affects PHP 8.4 and 8.5 streams in Red Hat Enterprise Linux 10 and Red Hat In-Vehicle OS 2.0.z. Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Red Hat Enterprise Linux 10 2026-08-19T00:00:00Z RHSA-2026:56969 php8.4-0:8.4.24-1.el10_2 Red Hat Hardened Images 2026-07-28T00:00:00Z RHSA-2026:47200 php-main-8.5.9-1.hum1 Red Hat Enterprise Linux 10 Not affected php Red Hat Enterprise Linux 6 Out of support scope php Red Hat Enterprise Linux 7 Not affected php Red Hat Enterprise Linux 8 Not affected php:7.4/php Red Hat Enterprise Linux 8 Not affected php:8.2/php Red Hat Enterprise Linux 9 Not affected php Red Hat Enterprise Linux 9 Not affected php:8.2/php Red Hat Enterprise Linux 9 Not affected php:8.3/php https://www.cve.org/CVERecord?id=CVE-2026-17544 https://nvd.nist.gov/vuln/detail/CVE-2026-17544 https://github.com/php/php-src/security/advisories/GHSA-x692-q9x7-8c3f