CVE-2026-25506 — MUNGE has a buffer overflow in message unpacking allows key leakage and credential forgery

Description (CNA)

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.

Affected (CNA)

Vendor / product	Versions
dun / munge	affected >= 0.5, < 0.5.18

CWE

CWE-787

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.

CVE

No English description supplied.

redhat-SADP

A buffer overflow vulnerability was discovered in the MUNGE authentication daemon (munged). In affected versions, a local attacker can potentially leak secret cryptographic key material from the daemon's memory by sending a specially crafted message with an oversized address field. With the leaked key, an attacker could forge authentication credentials to impersonate any user, potentially escalating privileges in systems that rely on MUNGE for identity verification.