{"id":"CVE-2026-111808","revision":null,"records":[{"revision":"e4d6956aee3a48f283c202a717dc3ae7","observedAt":"2026-10-23T22:48:20.692+00:00","statement":{"source":"cve-program","id":"CVE-2026-111808","aliases":[],"title":"Apache Traffic Server: HTTP/2 DATA frame padding underflow lets a client trigger backend worker-pool exhaustion","description":"Apache Traffic Server can be used to exhaust an HTTP/1.1 origin's worker pool via a malformed padded HTTP/2 DATA frame.\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.","state":0,"publishedAt":"2026-10-21T19:11:59.516+00:00","modifiedAt":"2026-10-23T21:22:09.15+00:00","affected":[{"ecosystem":"Vendor product","name":"Apache Traffic Server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Apache Software Foundation\",\n                    \"product\": \"Apache Traffic Server\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"8.0.0\",\n                            \"lessThanOrEqual\": \"8.1.11\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"9.0.0\",\n                            \"lessThanOrEqual\": \"9.2.15\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"10.0.0\",\n                            \"lessThanOrEqual\": \"10.1.4\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"10.2.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","score":8.6,"severity":"HIGH"},{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H","score":7.7,"severity":"HIGH"}],"references":["https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-111808","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-111808","identifiers":["CVE-2026-111808"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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