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Description

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.

PUBLISHED Reserved 2026-07-08 | Published 2026-07-09 | Updated 2026-07-14 | Assigner VulnCheck




HIGH: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

NULL Pointer Dereference

Product status

Default status
affected

Any version before 8.0.9
affected

Credits

Jaime Sánchez Sánchez finder

References

github.com/zeek/zeek/releases/tag/v8.0.9 (Release Notes) release-notes

github.com/...ommit/c82e3c734893d932e94310aec0dbeb1ffcea169d (Patch Commit) patch

www.vulncheck.com/...ence-dos-via-kerberos-krb-error-parsing third-party-advisory

cve.org (CVE-2026-60109)

nvd.nist.gov (CVE-2026-60109)

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