Critical Remote Code Execution and Denial of Service Vulnerabilities in PHP 7.4
Summary
ALSA-2026:34354: Important: php:7.4 security update. Affects apcu-panel versions < 5.1.18-1.module_el8.6.0+2750+78feabcb. Fixed in 5.1.18-1.module_el8.6.0+2750+78feabcb. How to fix ↓
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Background
PHP is an HTML-embedded scripting language widely used for web development, particularly with the Apache HTTP Server. It enables developers to create dynamic web pages and applications. The PHP 7.4 version includes various extensions and functionalities, but it has been found vulnerable to multiple security issues, including remote code execution and denial of service, which could severely impact web applications relying on this version.
Vulnerability Detail
The vulnerabilities in PHP 7.4 stem from several issues, including a use-after-free vulnerability in the SOAP extension (CVE-2026-6722), which can lead to remote code execution. Additionally, improper handling of signed characters in ctype functions can cause denial of service (CVE-2026-7258). Other vulnerabilities include cross-site scripting due to improper URL sanitation (CVE-2026-6735) and memory corruption in the PHP SoapServer (CVE-2026-7261). These vulnerabilities can allow attackers to exploit the system, leading to unauthorized access, service disruptions, and potential data breaches.
How To Fix
Minimum fixed version
5.1.18-1.module_el8.6.0+2750+78feabcb
This is the first release that contains the fix.
sudo dnf update apcu-panelTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate updating is not feasible, consider disabling the affected PHP extensions temporarily until the update can be applied. This can be done by commenting out the relevant lines in the php.ini configuration file.
Conclusion
The vulnerabilities in PHP 7.4 pose significant risks to web applications, including remote code execution and denial of service. It is crucial to update to the latest patched version to mitigate these risks and ensure the security of your applications.
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FAQ
The vulnerabilities include remote code execution, denial of service, cross-site scripting, and memory corruption.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Consider disabling the affected PHP extensions temporarily as a workaround until you can apply the update.
Yes, packages such as php, php-bcmath, php-cli, php-common, and others related to PHP need to be updated to the patched version.
Exploitation of these vulnerabilities can lead to unauthorized access, service disruptions, and potential data breaches.
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