CVE-2024-11235: Reference counting in php_request_shutdown causes Use-After-Free

Severity: high (CVSS 8.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2025-04-04 · updated 2026-06-17
Weakness: CWE-416

Description

In PHP versions 8.3.* before 8.3.19 and 8.4.* before 8.4.5, a code sequence involving __set handler or ??= operator and exceptions can lead to a use-after-free vulnerability. If the third party can control the memory layout leading to this, for example by supplying specially crafted inputs to the script, it could lead to remote code execution.

Affected products

PHP: from 8.3.0 before 8.3.19; from 8.4.0 before 8.4.5 — fixed in 8.3.19, 8.4.5

How to fix

Upgrade to a fixed version: PHP 8.3.19, 8.4.5. Check the vendor advisory for mitigations.

References

https://github.com/php/php-src/security/advisories/GHSA-rwp7-7vc6-8477
https://github.com/php/php-src/security/advisories/GHSA-rwp7-7vc6-8477

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