Critical Vulnerability in PHP OpenSSL Extension: Denial of Service Risk
Summary
ALSA-2026:48197: Low: php:8.3 security, bug fix, and enhancement update. Affects apcu-panel versions < 5.1.23-1.module_el9.6.0+151+5f31e576. Fixed in 5.1.23-1.module_el9.6.0+151+5f31e576. How to fix ↓
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Background
PHP is a widely-used open-source scripting language designed for web development. It is embedded in HTML and is particularly effective for server-side scripting. The PHP OpenSSL extension provides secure communication over networks, enabling encryption and decryption of data. However, a recent vulnerability has been identified that could lead to a Denial of Service (DoS) attack due to a buffer allocation flaw in the AES-WRAP-PAD functionality, affecting the stability and availability of applications relying on this extension.
Vulnerability Detail
The vulnerability arises from a buffer allocation flaw in the AES-WRAP-PAD functionality of the PHP OpenSSL extension. This flaw can be exploited by an attacker to cause a Denial of Service (DoS), potentially leading to application crashes or unavailability. The vulnerability has been assigned the identifier CVE-2026-14355. It is crucial for developers and system administrators to understand the implications of this vulnerability, as it can severely impact the performance and reliability of web applications using PHP.
How To Fix
Minimum fixed version
5.1.23-1.module_el9.6.0+151+5f31e576
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
As a temporary workaround, consider disabling the PHP OpenSSL extension if it is not critical for your application. This can be done by commenting out the extension in the php.ini configuration file:
;extension=openssl
However, this may affect any functionality that relies on secure communications.
Conclusion
The identified vulnerability in the PHP OpenSSL extension poses a significant risk of Denial of Service attacks, affecting the stability of applications. It is essential to apply the available patches promptly and consider temporary workarounds if necessary. Regular monitoring for vulnerabilities using tools like Vulert can help maintain application security.
See every vulnerability recorded for apcu-panel →
FAQ
The vulnerability is a buffer allocation flaw in the PHP OpenSSL extension that can lead to a Denial of Service (DoS) attack.
You can use Vulert, which monitors open-source vulnerabilities in your software by analyzing the manifest file like package-lock.json. Visit Vulert Scanner to check your application without any signup.
Exploitation of this vulnerability can result in application crashes, service unavailability, and degraded performance for users.
Yes, a patch is available. Update your PHP package to version 8.3.32-1.module_el9.8.0+287+a9a5bb73 to mitigate the risk.
If immediate updates are not possible, consider disabling the PHP OpenSSL extension as a temporary workaround, but be aware that this may impact secure functionalities.
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