CVE-2026-25506

Publication date 10 February 2026

Last updated 12 February 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.7 · High

Score breakdown

Description

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.

Status

Package Ubuntu Release Status
munge 25.10 questing
Fixed 0.5.16-1ubuntu0.1
24.04 LTS noble
Fixed 0.5.15-4ubuntu0.1
22.04 LTS jammy
Fixed 0.5.14-6ubuntu0.1
20.04 LTS focal
Fixed 0.5.13-2ubuntu0.1~esm1
18.04 LTS bionic
Fixed 0.5.13-1ubuntu0.1~esm1
16.04 LTS xenial
Fixed 0.5.11-3ubuntu0.1+esm1
14.04 LTS trusty
Fixed 0.5.11-1ubuntu1.1+esm1

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
munge

Severity score breakdown

Parameter Value
Base score 7.7 · High
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Changed
Confidentiality High
Integrity impact High
Availability impact Low
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L

References

Related Ubuntu Security Notices (USN)

Other references