{"id":"BIT-envoy-2023-27491","summary":"Envoy forwards invalid Http2/Http3 downstream headers","details":"Envoy is an open source edge and service proxy designed for cloud-native applications. Compliant HTTP/1 service should reject malformed request lines. Prior to versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9, There is a possibility that non compliant HTTP/1 service may allow malformed requests, potentially leading to a bypass of security policies. This issue is fixed in versions 1.26.0, 1.25.3, 1.24.4, 1.23.6, and 1.22.9.","aliases":["CVE-2023-27491","GHSA-5jmv-cw9p-f9rp"],"modified":"2026-09-08T08:47:33.470534438Z","published":"2024-03-06T10:54:12.095Z","database_specific":{"cpes":["cpe:2.3:a:envoyproxy:envoy:*:*:*:*:*:*:*:*"],"severity":"Critical"},"references":[{"type":"WEB","url":"https://datatracker.ietf.org/doc/html/rfc9113#section-8.3"},{"type":"WEB","url":"https://datatracker.ietf.org/doc/html/rfc9114#section-4.3.1"},{"type":"ADVISORY","url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-5jmv-cw9p-f9rp"},{"type":"WEB","url":"https://www.rfc-editor.org/rfc/rfc9110#section-5.6.2"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27491"}],"affected":[{"package":{"name":"envoy","ecosystem":"Bitnami","purl":"pkg:bitnami/envoy"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.22.9"},{"introduced":"1.23.0"},{"fixed":"1.23.6"},{"introduced":"1.24.0"},{"fixed":"1.24.4"},{"introduced":"1.25.0"},{"fixed":"1.25.3"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/envoy/BIT-envoy-2023-27491.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N"}]}],"schema_version":"1.9.0"}