CVE-2026-60109: Zeek

High severity, CVSS 7.5. EPSS: 0.9% chance of exploitation in the next 30 days.

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.

Affected products

• Zeek Zeek: before 8.0.9 (fixed in 8.0.9)

Published 2026-07-09. Last modified 2026-07-14.