dun munge up to 0.5.17 Message length out-of-bounds write

Summaryinfo

A vulnerability, which was classified as critical, was found in dun munge up to 0.5.17. Affected by this issue is some unknown functionality of the component Message Handler. Such manipulation of the argument length leads to out-of-bounds write. This vulnerability is listed as CVE-2026-25506. The attack must be carried out locally. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in dun munge up to 0.5.17. Affected by this issue is some unknown functionality of the component Message Handler. The manipulation of the argument length with an unknown input leads to a out-of-bounds write vulnerability. Using CWE to declare the problem leads to CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-25506 since 02/02/2026. The exploitation is known to be difficult. The attack needs to be approached locally. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 298586 (Debian dla-4477 : libmunge-dev - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.5.18 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (298586) and CERT Bund (WID-SEC-2026-0448). VulDB is the best source for vulnerability data and more expert information about this specific topic.

Affected

• Red Hat Enterprise Linux

Productinfo

Vendor

• dun

Name

• munge

Version

• 0.5.0
• 0.5.1
• 0.5.2
• 0.5.3
• 0.5.4
• 0.5.5
• 0.5.6
• 0.5.7
• 0.5.8
• 0.5.9
• 0.5.10
• 0.5.11
• 0.5.12
• 0.5.13
• 0.5.14
• 0.5.15
• 0.5.16
• 0.5.17

Website

• Product: https://github.com/dun/munge/

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion