PT-2026-56810 · Zeek · Zeek

Published 2026-07-09 · Updated 2026-07-09 · CVE-2026-60109

NVD

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-60109

Affected Products

Zeek

References · 4

• https://nvd.nist.gov/vuln/detail/CVE-2026-60109 · Security Note
• https://github.com/zeek/zeek/commit/c82e3c734893d932e94310aec0dbeb1ffcea169d · Patch
• https://github.com/zeek/zeek/releases/tag/v8.0.9 · Note
• https://vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsing · Note