CVE-2026-25506
Estado: ModificadaAlta (7.8)—
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
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Puntuación base: 7.8
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.28%
- Percentil entre todas las CVEs puntuadas: 19
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK
Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
- Explotación
T1068Exploitation for Privilege Escalationprivilege escalation95 % - Impacto principal
T1078Valid Accountsstealth · persistence · privilege escalation · initial access90 % - Impacto secundario
T1059Command and Scripting Interpreterexecution75 %
Buffer overflow local (AV:L, PR:L) requiere escalada. Fuga de claves criptográficas permite falsificar credenciales (T1078) e impersonar root para ejecución remota (T1059).
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas
Tecnologías afectadas (2)
CWE
- CWE-787
- CWE-120
Referencias
- 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
JSON original (NVD)
Mostrar
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"value": "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."
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