Bug 2438715 (CVE-2026-25506)

Summary: CVE-2026-25506 MUNGE: MUNGE has a buffer overflow in message unpacking allows key leakage and credential forgery
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: asoldano, bbaranow, bmaxwell, brian.stansberry, darran.lofthouse, dosoudil, fjuma, gmalinko, gotiwari, istudens, ivassile, iweiss, janstey, jgrulich, jhorak, mosmerov, msvehla, mvyas, nwallace, pberan, pdelbell, pesilva, pjindal, pmackay, ppisar, rstancel, rstepani, s.butcher, smaestri, tom.jenkinson, tpopela, woodard
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
URL: https://github.com/dun/munge/security/advisories/GHSA-r9cr-jf4v-75gh
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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.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On: 2438832, 2438833, 2438926, 2438927, 2438928, 2438929, 2438930, 2438931, 2438932, 2438933, 2438934    
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Description OSIDB Bzimport 2026-02-10 20:03:09 UTC 
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.