{"id":"AZL-97557","summary":"CVE-2026-63379 affecting package ntp 4.2.8p17-2","details":"Libevent is an event notification library. Prior to 2.1.13 and 2.2.2-alpha, libevent processes chunked HTTP trailers in http.c through evhttp_read_trailer and merges them into request headers. The fix introduces evhttp_parse_headers_impl_ and a temporary trailer header list. An unauthenticated remote attacker can place security-sensitive fields in trailers so that an upstream proxy and the libevent application interpret different effective headers, enabling header smuggling, authorization bypass, proxy-header spoofing, or cache poisoning. The fix parses trailers into a temporary header list and discards them instead of merging them into req-\u003einput_headers. This issue is fixed in versions 2.1.13 and 2.2.2-alpha.","modified":"2026-08-29T05:27:27Z","published":"2026-08-20T18:16:35Z","upstream":["CVE-2026-63379"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-63379"}],"affected":[{"package":{"name":"ntp","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/ntp"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"4.2.8p17-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-97557.json"}}],"schema_version":"1.9.0"}