Moderate Vulnerability in PAM Package: Plaintext Password Recovery Risk
Summary
ALSA-2026:64815: Moderate: pam security update. Affects pam versions < 1.5.1-28.el9_8.1. Fixed in 1.5.1-28.el9_8.1. How to fix ↓
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Background
Pluggable Authentication Modules (PAM) is a framework that allows system administrators to set up authentication policies without recompiling applications. It is widely used in various Linux distributions, including AlmaLinux, to manage user authentication. The PAM package provides essential functionalities for secure user access and is critical for maintaining system integrity.
Vulnerability Detail
The vulnerability identified as CVE-2026-54411 affects the pam_userdb module within the PAM framework. It allows an attacker to recover plaintext passwords through a timing discrepancy, potentially compromising user accounts. This vulnerability arises from improper handling of authentication processes, which can lead to unauthorized access if exploited. The ramifications include increased risk of data breaches and unauthorized system access, making it crucial for users to address this issue promptly.
How To Fix
Minimum fixed version
1.5.1-28.el9_8.1
This is the first release that contains the fix.
sudo dnf update pamTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, system administrators can consider disabling the pam_userdb module until the package is updated. This can be done by commenting out the relevant lines in the PAM configuration files, though this may impact authentication processes.
Conclusion
The PAM package vulnerability CVE-2026-54411 poses a significant risk due to the potential for plaintext password recovery. Users are strongly advised to update their PAM packages to the fixed version 1.5.1-28.el9_8.1 to mitigate this risk. Additionally, utilizing tools like Vulert can help monitor for vulnerabilities in real-time.
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FAQ
The CVE identifier for this vulnerability is CVE-2026-54411.
The vulnerability affects the PAM package in AlmaLinux 9 and potentially other distributions using the same version of PAM.
You can use Vulert's playground at Vulert Scanner to check if your application is affected by this vulnerability without requiring any signup.
Failure to address this vulnerability may lead to unauthorized access to user accounts and sensitive data breaches.
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.
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