{"id":"CVE-2026-60109","state":"PUBLISHED","title":"Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing","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.","publishedAt":"2026-07-09T14:19:17.970Z","updatedAt":"2026-07-14T22:03:33.470Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["zeek zeek"],"affected":[{"vendor":"zeek","product":"zeek","packageURL":"pkg:github/zeek/zeek","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"8.0.9","versionType":"semver"}],"repo":"https://github.com/zeek/zeek"}],"references":["https://github.com/zeek/zeek/releases/tag/v8.0.9","https://github.com/zeek/zeek/commit/c82e3c734893d932e94310aec0dbeb1ffcea169d","https://www.vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsing"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/60xxx/CVE-2026-60109.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-60109","state":"PUBLISHED","datePublished":"2026-07-09T14:19:17.970Z","dateUpdated":"2026-07-14T22:03:33.470Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-07-08T13:27:53.030Z"},"containers":{"cna":{"title":"Zeek < 8.0.9 Null Pointer Dereference DoS via Kerberos KRB_ERROR Parsing","descriptions":[{"lang":"en","value":"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":[{"vendor":"zeek","product":"zeek","packageURL":"pkg:github/zeek/zeek","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"8.0.9","versionType":"semver"}],"repo":"https://github.com/zeek/zeek"}],"references":[{"url":"https://github.com/zeek/zeek/releases/tag/v8.0.9","name":"Release Notes","tags":["release-notes"]},{"url":"https://github.com/zeek/zeek/commit/c82e3c734893d932e94310aec0dbeb1ffcea169d","name":"Patch Commit","tags":["patch"]},{"url":"https://www.vulncheck.com/advisories/zeek-null-pointer-dereference-dos-via-kerberos-krb-error-parsing","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.7,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","version":"3.1","baseSeverity":"HIGH","baseScore":7.5,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"NULL Pointer Dereference","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-07-14T22:03:33.470Z"},"tags":["x_open-source"],"datePublic":"2026-07-06T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:zeek:zeek:*:*:*:*:*:*:*:*","versionEndExcluding":"8.0.9"}]}]}],"credits":[{"lang":"en","value":"Jaime Sánchez Sánchez","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-09T18:17:17.788848Z","id":"CVE-2026-60109","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-09T18:17:23.735Z"}}]}}}