Bug 2498526 (CVE-2026-60109)

Summary:	CVE-2026-60109 zeek: Zeek: Denial of Service via crafted Kerberos KRB_ERROR message
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Zeek's Kerberos protocol analyzer. An unauthenticated remote attacker can exploit a vulnerability by sending a specially crafted Kerberos KRB_ERROR message. This can lead to a null pointer dereference due to a mismatch in the parser and analyzer state, causing the Zeek sensor to crash. This vulnerability results in a Denial of Service (DoS) for the affected system.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2499666, 2499667
Bug Blocks:

Description OSIDB Bzimport 2026-07-09 15:01:28 UTC

Zeek before 8.0.9 contains a null pointer dereference vulnerability in its Kerberos protocol analyzer that allows unauthenticated remote attackers to crash the sensor by sending a crafted KRB_ERROR message with error-code 25 (KDC_ERR_PREAUTH_REQUIRED) containing a PA-DATA element with padata-type 2, 3, 11, or 19. Attackers can exploit a parser and analyzer state mismatch where proc_padata() dereferences an uninitialized pa_data_element field selected by the wrong parsing arm, triggering a crash via a single UDP or TCP packet to port 88 without any credentials or prior authentication.