{"id":"CVE-2026-111809","aliases":[],"title":"Apache Traffic Server: HEAD requests carrying Content-Length or Transfer-Encoding enable request smuggling","titleSource":"apache","descriptionSource":"apache","products":[{"vendor":"Apache Software Foundation","name":"Apache Traffic Server","platforms":[],"versions":[{"version":"8.0.0","status":"affected","lessThanOrEqual":"8.1.11","versionType":"semver"},{"version":"9.0.0","status":"affected","lessThanOrEqual":"9.2.15","versionType":"semver"},{"version":"10.0.0","status":"affected","lessThanOrEqual":"10.1.4","versionType":"semver"},{"version":"10.2.0","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected","source":"apache","url":"https://www.cve.org/CVERecord?id=CVE-2026-111809"}],"remediation":[],"description":"Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding.\n\n\n\nThis issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 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issue.","severity":"critical","score":9.3,"published":"2026-10-21T19:16:16.439Z","modified":"2026-10-28T01:34:23.820Z","withdrawn":false,"knownExploited":false,"affected":[],"references":["https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"],"sources":[{"name":"CVE","id":"CVE-2026-111809","modified":"2026-10-28T01:34:23.820Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-111809"}],"assessments":[{"source":"apache","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N","score":9.3},{"source":"apache","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:H/SA:N","score":6.9}],"sourceAffected":[],"kev":{"status":"not-listed","checkedAt":"2026-10-29T00:55:32.564Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[]}