Critical Security Update for php-phpseclib3: Addressing Vulnerability CVE-2026-32935
Summary
DSA-6187-1: php-phpseclib3 - security update. Affects php-phpseclib3 versions < 3.0.19-1+deb12u4. Fixed in 3.0.19-1+deb12u4. How to fix ↓
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Background
php-phpseclib3 is a widely used PHP library that provides a pure PHP implementation of various cryptographic algorithms. It is designed to facilitate secure data transmission and storage, making it essential for applications that require encryption and secure communications. The library is utilized in numerous web applications, which makes its security paramount to protect sensitive data from potential threats.
Vulnerability Detail
The vulnerability identified as CVE-2026-32935 in php-phpseclib3 arises from inadequate input validation, which could allow an attacker to exploit the library and execute arbitrary code. This could lead to unauthorized access to sensitive data or even complete system compromise. The issue is particularly concerning for applications that rely on this library for cryptographic operations, as it undermines the integrity and confidentiality of the data being processed.
How To Fix
Minimum fixed version
3.0.19-1+deb12u4
This is the first release that contains the fix.
sudo apt-get install --only-upgrade php-phpseclib3Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If immediate upgrading is not feasible, consider temporarily disabling features that rely on php-phpseclib3 until the patch can be applied. Additionally, ensure that your application is not exposed to untrusted input that could exploit this vulnerability.
Conclusion
The php-phpseclib3 library has a critical vulnerability (CVE-2026-32935) that requires immediate attention. Updating to the latest patched versions is essential to ensure the security of applications using this library. Regular monitoring and prompt updates are crucial in maintaining a secure software environment.
See every vulnerability recorded for php-phpseclib3 →
FAQ
CVE-2026-32935 is a security vulnerability in the php-phpseclib3 library that allows for potential arbitrary code execution due to inadequate input validation.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
Failing to address this vulnerability could lead to unauthorized access to sensitive data, data breaches, and potential system compromise.
Yes, Vulert can monitor and alert you in real-time for open-source vulnerabilities in your software using just a manifest file like package-lock.json.
If you cannot update the package right away, consider disabling features that rely on php-phpseclib3 and avoid processing untrusted input.
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