{"id":"CVE-2026-73547","published":"2026-09-21T20:17:28.230","lastModified":"2026-09-21T20:17:28.230","description":"Envoy is an open source edge and service proxy designed for cloud-native applications. Prior to 1.36.10, 1.37.6, 1.38.4, and 1.39.1, Envoy's ext_authz filter assumes that a request contains a :path pseudoheader when applying query_parameters_to_set or query_parameters_to_remove from an authorization response. A path-less CONNECT request makes request_headers_->Path() return null, and Filter::onComplete dereferences that pointer while parsing the query string. An unauthenticated downstream client can crash the Envoy process when the filter and authorization response use query-parameter mutation. The relevant scope boundary is that the deployment must accept path-less CONNECT and configure ext_authz query-parameter mutation. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.","cvssScore":7.5,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-20","CWE-476"],"vendors":[],"products":[],"references":[{"url":"https://github.com/envoyproxy/envoy/commit/064af2e61d0d1c421490d9e3e6e643c5d117ffe4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/5f3b8e9b2b8a787a63202d35bb38820f3e9271fe","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/838f8ffd9d7b5217682a22ee33470d4c7afb7e98","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/c3170d7c747e51bb8254378ea89afc03d3e71929","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1","tags":[]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-87ph-jqwm-pg6r","tags":[]}],"exploitRefs":[{"url":"https://github.com/envoyproxy/envoy/commit/064af2e61d0d1c421490d9e3e6e643c5d117ffe4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/5f3b8e9b2b8a787a63202d35bb38820f3e9271fe","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/838f8ffd9d7b5217682a22ee33470d4c7afb7e98","tags":[]},{"url":"https://github.com/envoyproxy/envoy/commit/c3170d7c747e51bb8254378ea89afc03d3e71929","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.36.10","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.37.6","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.38.4","tags":[]},{"url":"https://github.com/envoyproxy/envoy/releases/tag/v1.39.1","tags":[]},{"url":"https://github.com/envoyproxy/envoy/security/advisories/GHSA-87ph-jqwm-pg6r","tags":[]}],"hasPoc":true,"ai":{"summary":"The flaw allows an unauthenticated client to crash Envoy by sending a path-less CONNECT request, exploiting misconfiguration of query-parameter mutation in the ext_authz filter.","exploitability":"Exploitation requires specific configuration and a path-less CONNECT request; not easily achievable without knowledge of the exact setup.","blast_radius":"If exploited, it could lead to service disruption or denial of service for Envoy-based services.","remediation":"Update to Envoy versions 1.36.10, 1.37.6, 1.38.4, or 1.39.1 to mitigate the risk.","tags":["denial-of-service","misconfiguration","proxy"],"model":"qwen2.5:7b-instruct","analyzedAt":"2026-09-22T06:13:07.593Z"}}