CVE-2026-25506
What it is
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.
At a glance
- Exploitability
- Can be exploited locally on the machine with a low-privilege account. High risk of data exposure, data tampering.
- Exploit odds
- 0.3% chance of exploitation in the next 30 days (EPSS).
- Fix
- A patch, advisory or fixed version is referenced. Upgrade or apply it.
Timeline
- PublishedDisclosed publicly on CVE.org and NVD
- Last updatedMost recent change to the record
Why it ranks here
- Exploited in the wild: no, CISA does not list it.
- Exploit odds: 0.3% in the next 30 days (EPSS).
- Severity: 7.7 HIGH (CVSS).
- Fix: a patch or advisory is linked.
Details
- Published
- Last modified
- Exploit probability
- 0.3% · EPSS, next 30 days
- Weakness
- CWE-787 · Out-of-bounds write
- Record status
- Modified
Affected
- Opensuse Munge < 0.5.18
- Debian Linux 11.0
Attack profile CVSS 3.1 · 7.7
- Attack vector
- Local
- Complexity
- High
- Privileges needed
- Low
- User interaction
- None
- Scope
- Changed
- Confidentiality
- High
- Integrity
- High
- Availability
- Low
Raw vector
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L
Is it in your code?
Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.
Read https://cve-list.com/agent/cve/CVE-2026-25506.md and follow it. Check whether this project is affected by CVE-2026-25506. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.
Fix and advisories
- https://github.com/dun/munge/commit/bf40cc27c4ce8451d4b062c9de0b67ec40894812
- https://github.com/dun/munge/releases/tag/munge-0.5.18
- https://github.com/dun/munge/security/advisories/GHSA-r9cr-jf4v-75gh
- http://www.openwall.com/lists/oss-security/2026/02/10/3
References
- https://github.com/dun/munge/commit/bf40cc27c4ce8451d4b062c9de0b67ec40894812
- https://github.com/dun/munge/releases/tag/munge-0.5.18
- https://github.com/dun/munge/security/advisories/GHSA-r9cr-jf4v-75gh
- http://www.openwall.com/lists/oss-security/2026/02/10/3
- http://www.openwall.com/lists/oss-security/2026/02/17/6
- https://lists.debian.org/debian-lts-announce/2026/02/msg00015.html
- https://access.redhat.com/errata/RHSA-2026:16174
- https://access.redhat.com/errata/RHSA-2026:2918
- https://access.redhat.com/errata/RHSA-2026:2923
- https://access.redhat.com/errata/RHSA-2026:2934
- https://access.redhat.com/errata/RHSA-2026:2949
- https://access.redhat.com/errata/RHSA-2026:2954
- https://access.redhat.com/errata/RHSA-2026:3010
- https://access.redhat.com/errata/RHSA-2026:3011
- https://access.redhat.com/errata/RHSA-2026:3012
- https://access.redhat.com/errata/RHSA-2026:3013
- https://access.redhat.com/errata/RHSA-2026:3032
- https://access.redhat.com/errata/RHSA-2026:3033
- https://access.redhat.com/errata/RHSA-2026:3034
- https://access.redhat.com/security/cve/CVE-2026-25506
- https://bugzilla.redhat.com/show_bug.cgi?id=2438715
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25506.json