CVE-2026-112321
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Memory Leak in MIT Kerberos kadmind via AUTH_GSSAPI

Publication date: 2026-11-09

Last updated on: 2026-11-09

Assigner: redhat-SADP

Description
The AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c in MIT Kerberos 5 (aka krb5) does not free decoded arguments on certain error paths, which allows remote attackers to cause a denial of service (memory exhaustion in kadmind) via crafted AUTH_GSSAPI_INIT requests that trigger authentication failures.

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Meta Information

Published
2026-11-09
Last Modified
2026-11-09
Generated
2026-11-09
AI Q&A
2026-11-09
EPSS Evaluated
N/A
NVD
CVE-2026-112321
EUVD
EUVD-2026-120237

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-772 The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.

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Executive Summary

The vulnerability in MIT Kerberos 5 (krb5) involves the AUTH_GSSAPI handler in lib/rpc/svc_auth_gssapi.c. When crafted AUTH_GSSAPI_INIT requests trigger authentication failures, the handler fails to free decoded arguments on certain error paths. This leads to memory exhaustion in the kadmind service, causing a denial of service.

Impact Analysis

This vulnerability can cause a denial of service by exhausting memory in the kadmind service. If exploited, it may disrupt authentication services, leading to system unavailability or degraded performance for users relying on Kerberos authentication.

Mitigation Strategies

Apply the latest security patches for MIT Kerberos 5 (krb5) to address the memory exhaustion issue in the AUTH_GSSAPI handler. Monitor kadmind processes for unusual memory usage and restart them if necessary.

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