{"id":"CVE-2026-111810","state":"PUBLISHED","title":"Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denial of service","description":"Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains.\n\n\n\nThis issue affects Apache Traffic Server: 9.2.15, 10.1.4, 10.2.0.\n\n\n\nUsers are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.","publishedAt":"2026-10-21T19:14:50.479Z","updatedAt":"2026-10-23T21:21:35.176Z","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":"apache"},"assigner":"apache","products":["Apache Software Foundation Apache Traffic Server"],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Traffic Server","defaultStatus":"unaffected","versions":[{"version":"9.2.15","status":"affected","versionType":"semver"},{"version":"10.1.4","status":"affected","versionType":"semver"},{"version":"10.2.0","status":"affected","versionType":"semver"}]}],"references":["https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"],"weaknesses":["CWE-400"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/111xxx/CVE-2026-111810.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-111810","state":"PUBLISHED","datePublished":"2026-10-21T19:14:50.479Z","dateUpdated":"2026-10-23T21:21:35.176Z","assignerShortName":"apache","assignerOrgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateReserved":"2026-10-16T20:21:06.042Z"},"containers":{"cna":{"title":"Apache Traffic Server: Unthrottled per-header diagnostic logging enables a log-flood denial of service","descriptions":[{"lang":"en","value":"Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains.\n\n\n\nThis issue affects Apache Traffic Server: 9.2.15, 10.1.4, 10.2.0.\n\n\n\nUsers are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue."}],"affected":[{"vendor":"Apache Software Foundation","product":"Apache Traffic Server","defaultStatus":"unaffected","versions":[{"version":"9.2.15","status":"affected","versionType":"semver"},{"version":"10.1.4","status":"affected","versionType":"semver"},{"version":"10.2.0","status":"affected","versionType":"semver"}]}],"references":[{"url":"https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc","tags":["vendor-advisory"]}],"metrics":[{"other":{"type":"Textual description of severity","content":{"text":"important"}},"scenarios":[{"lang":"en","value":"GENERAL"}]},{"scenarios":[{"lang":"en","value":"GENERAL"}],"format":"CVSS","cvssV3_1":{"version":"3.1","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","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"}},{"scenarios":[{"lang":"en","value":"GENERAL"}],"format":"CVSS","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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-400","description":"CWE-400 Uncontrolled Resource Consumption","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"apache","orgId":"f0158376-9dc2-43b6-827c-5f631a4d8d09","dateUpdated":"2026-10-21T19:14:50.479Z"},"source":{"discovery":"UNKNOWN"},"credits":[{"lang":"en","value":"Apache Community","type":"reporter"}],"x_generator":{"engine":"scripts/cve_render.py"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-23T17:32:45.777039Z","id":"CVE-2026-111810","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":"2026-10-23T21:21:35.176Z"}}]}}}