Critical Security Update for PHP: Denial of Service and XSS Vulnerabilities in AlmaLinux 9 Packages
Summary
ALSA-2026:22143: Important: php:8.2 security update. Affects apcu-panel versions < 5.1.23-1.module_el9.4.0+65+49ff6472. Fixed in 5.1.23-1.module_el9.4.0+65+49ff6472. How to fix ↓
Check if this vulnerability affects your application
Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.
No signup required · Results in about 60 seconds
Background
PHP is a widely-used open-source scripting language designed for web development but also used as a general-purpose programming language. It is especially known for its ability to embed HTML and is commonly used with the Apache HTTP Server. The recent vulnerabilities identified in PHP versions prior to 8.2.31 expose applications to significant security risks, including Denial of Service (DoS) and Cross-Site Scripting (XSS) attacks, which can compromise the integrity and availability of web applications.
Vulnerability Detail
The vulnerabilities stem from improper handling of signed characters in ctype functions, leading to potential Denial of Service (CVE-2026-7258). Additionally, a Cross-Site Scripting vulnerability exists in PHP-FPM due to inadequate URL sanitation (CVE-2026-6735). Other issues include a NULL pointer dereference in the SOAP apache:Map decoder (CVE-2026-7262) and a signed integer overflow in the metaphone() function (CVE-2026-7568). These vulnerabilities can allow attackers to exploit web applications, causing service disruptions or unauthorized access to sensitive data.
How To Fix
Minimum fixed version
5.1.23-1.module_el9.4.0+65+49ff6472
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 patching is not possible, consider implementing input validation and sanitization measures to mitigate the risk of XSS attacks. Additionally, monitor your application for unusual behavior that may indicate a DoS attack.
Conclusion
The vulnerabilities identified in PHP versions prior to 8.2.31 pose significant risks to web applications, including Denial of Service and Cross-Site Scripting. It is crucial for users to update their PHP installations to the latest patched versions to mitigate these risks. Utilizing tools like Vulert can help monitor for such vulnerabilities effectively.
See every vulnerability recorded for apcu-panel →
FAQ
The Denial of Service vulnerability can lead to application downtime, making it inaccessible to users and potentially causing loss of revenue and trust.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
Run the command 'sudo dnf update php php-*' to update all PHP-related packages to their latest patched versions.
While specific exploits may not be publicly disclosed, the nature of the vulnerabilities suggests that they could be exploited by attackers to disrupt services or execute malicious scripts.
Implement input validation and sanitization to reduce the risk of XSS attacks and monitor your application for any signs of unusual activity.
Related vulnerabilities
Recent vulnerabilities recorded for apcu-panel.
