CVE-2026-73547

Vulnerability 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.

CVSS Score

Affected Products

Related Weaknesses (CWE)

References

• https://github.com/envoyproxy/envoy/commit/064af2e61d0d1c421490d9e3e6e643c5d117fPatch
• https://github.com/envoyproxy/envoy/commit/5f3b8e9b2b8a787a63202d35bb38820f3e927Patch
• https://github.com/envoyproxy/envoy/commit/838f8ffd9d7b5217682a22ee33470d4c7afb7Patch
• https://github.com/envoyproxy/envoy/commit/c3170d7c747e51bb8254378ea89afc03d3e71Patch
• https://github.com/envoyproxy/envoy/releases/tag/v1.36.10Release Notes
• https://github.com/envoyproxy/envoy/releases/tag/v1.37.6Release Notes
• https://github.com/envoyproxy/envoy/releases/tag/v1.38.4Release Notes
• https://github.com/envoyproxy/envoy/releases/tag/v1.39.1Release Notes
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-87ph-jqwm-pg6rExploitVendor Advisory