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TI-2026-42831 Aliases CVE-2026-60109GHSA-76hq-67jv-x5j7

Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing

Priority MEDIUM 45CWE-476Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-476.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00923 60th percentileScored 2026-11-07
Fix Fixed zeek (zeek): 8.0.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
zeekzeekbefore 8.0.98.0.9Patch availableCNA
  • zeek Vendorzeek Affected before 8.0.9 Fixed in 8.0.9 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:zeek:zeek:*:*:*:*:*:*:*:*before 8.0.9Vulnerablezeek
  • cpe:2.3:a:zeek:zeek:*:*:*:*:*:*:*:* Versions before 8.0.9 Vulnerable ·zeek

Remediation

  • Fix · CNA zeek (zeek) Fixed in 8.0.9

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Release ·

    zeek 8.0.9

    2 records Highest priority Priority MEDIUM 2 MEDIUM

    Other records, highest priority first

    • TI-2026-42830 Zeek < 8.0.9 Uncontrolled Memory Consumption DoS via FTP AnalyzerPriority MEDIUM 45
    Show all 2 records →

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-60109
  2. 2026-10-03 Alias added: GHSA-76hq-67jv-x5j7

References

Patch 1

Other 1

  • TI-2021-18391 An issue was discovered in zeek version 4.1.0. CVSS 3.1HIGH 8.2
  • TI-2026-42830 Zeek < 8.0.9 Uncontrolled Memory Consumption DoS via FTP Analyzer CVSS 4.0HIGH 8.7
  • TI-2019-09093 In Zeek Network Security Monitor (formerly known as Bro) before 2.6.2, a NULL pointer… CVSS 3.0HIGH 7.5

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences