Critical Buffer Overflow Vulnerability in MUNGE Authentication Service
Summary
ALSA-2026:3033: Important: munge security update. Affects munge versions < 0.5.15-11.el10_1. Fixed in 0.5.15-11.el10_1. 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
MUNGE (MUNGE Uid 'N' Gid Emporium) is an authentication service designed for creating and validating credentials in high-performance computing (HPC) cluster environments. It enables processes to authenticate user IDs (UIDs) and group IDs (GIDs) of local or remote processes within a defined security realm, which is established through a shared cryptographic key. MUNGE is highly scalable and allows clients to create and validate credentials without requiring root privileges or platform-specific methods.
Vulnerability Detail
The vulnerability arises from a buffer overflow in the message unpacking process of MUNGE, which can lead to key leakage and credential forgery. This flaw, identified as CVE-2026-25506, poses significant security risks, as it allows unauthorized users to potentially forge credentials and gain access to restricted resources within the security realm. The technical aspect of this vulnerability lies in the mishandling of input data, which can be exploited to overwrite memory and manipulate the application's behavior.
How To Fix
Minimum fixed version
0.5.15-11.el10_1
This is the first release that contains the fix.
sudo dnf update mungeTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, users may consider restricting access to the MUNGE service or implementing additional network security measures to limit exposure until the patch can be applied. However, the best course of action is to update to the patched version as soon as possible.
Conclusion
The buffer overflow vulnerability in MUNGE (CVE-2026-25506) poses serious security risks that can lead to credential forgery and unauthorized access. It is essential for users to update to the patched version (0.5.15-11.el10_1) to safeguard their systems. Employing Vulert can assist in real-time monitoring of vulnerabilities in open-source software.
See every vulnerability recorded for munge →
FAQ
MUNGE is an authentication service that allows processes to authenticate user and group IDs in HPC environments.
CVE-2026-25506 refers to a specific vulnerability in MUNGE that involves a buffer overflow leading to potential key leakage and credential forgery.
You can use Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected without needing to sign up.
The risks include unauthorized access to resources, potential data breaches, and compromised security within the HPC cluster.
Yes, temporarily restricting access to the MUNGE service and enhancing network security can help mitigate risks until the patch is applied.
Related vulnerabilities
Recent vulnerabilities recorded for munge.
