CVE-2026-111817

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{"bugzilla": {"description": "trafficserver: trafficserver: Denial of Service via dropped chunked trailers", "id": "2558505", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2558505"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-444", "details": ["Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.config.http.drop_chunked_trailers) until the connection times out, because it waits for the trailer bytes it has already dropped. Trailer dropping is on by default in 10.x. In 8.1.11 and 9.2.x it is off by default, and those versions are affected only if it is enabled.\nThis issue affects Apache Traffic Server: 8.1.11, from 9.2.5 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0.\nUsers are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.", "A flaw was found in Apache Traffic Server. When configured to drop HTTP chunked trailers, the proxy incorrectly waits for data bytes that it has already discarded, stalling the transfer until the connection times out. A remote attacker can exploit this condition by sending chunked transfers, resulting in a Denial of Service (DoS) for affected connections."], "mitigation": {"lang": "en:us", "value": "Disable proxy.config.http.drop_chunked_trailers on 8.1.11/9.2.x (off by default there; affected only if enabled); on 10.x, where the setting is on by default, upgrade to the fixed versions 10.1.5/10.2.1."}, "name": "CVE-2026-111817", "public_date": "2026-10-21T19:20:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-111817\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-111817\nhttps://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc"], "statement": "Apache Traffic Server can stall a chunked transfer that it passes through with its trailers removed (proxy.config.http.drop_chunked_trailers) until the connection times out, because it waits for the trailer bytes it has already dropped. Trailer dropping is on by default in 10.x; in 8.1.11 and 9.2.x it is off by default and those versions are affected only if it is enabled. Fix: upgrade to 10.1.5/10.2.1; 9.2.x users can disable drop_chunked_trailers.", "threat_severity": "Moderate"}

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