Out-of-bounds Write Affecting munge package, versions <0.5.13-2ubuntu0.1~esm1


Severity

Recommended
medium

Based on Ubuntu security rating.

Threat Intelligence

EPSS
0.3% (22nd percentile)

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  • Snyk IDSNYK-UBUNTU2004-MUNGE-15357571
  • published26 Feb 2026
  • disclosed10 Feb 2026

Introduced: 10 Feb 2026

CVE-2026-25506  (opens in a new tab)
CWE-787  (opens in a new tab)

How to fix?

Upgrade Ubuntu:20.04 munge to version 0.5.13-2ubuntu0.1~esm1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream munge package and not the munge package as distributed by Ubuntu. See How to fix? for Ubuntu:20.04 relevant fixed versions and status.

MUNGE is an authentication service for creating and validating user credentials. From 0.5 to 0.5.17, local attacker can exploit a buffer overflow vulnerability in munged (the MUNGE authentication daemon) to leak cryptographic key material from process memory. With the leaked key material, the attacker could forge arbitrary MUNGE credentials to impersonate any user (including root) to services that rely on MUNGE for authentication. The vulnerability allows a buffer overflow by sending a crafted message with an oversized address length field, corrupting munged's internal state and enabling extraction of the MAC subkey used for credential verification. This vulnerability is fixed in 0.5.18.

CVSS Base Scores

version 3.1