CVE-2026-25506

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.

• CWE-787

• https://github.com/dun/munge/commit/bf40cc27c4ce8451d4b062c9de0b67ec40894812Patch
• https://github.com/dun/munge/releases/tag/munge-0.5.18Product, Release Notes
• https://github.com/dun/munge/security/advisories/GHSA-r9cr-jf4v-75ghMitigation, Patch, Vendor Advisory
• http://www.openwall.com/lists/oss-security/2026/02/10/3Mailing List, Patch, Third Party Advisory
• http://www.openwall.com/lists/oss-security/2026/02/17/6Mailing List, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2026/02/msg00015.htmlMailing List, Third Party Advisory

Published

Feb 10, 2026

Last Modified

Jun 17, 2026

Status

Analyzed