CVE-2026-50572

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 HTTP external-authorization client can retain a stale request callback after a request is rejected. When RawHttpClientImpl::onSuccess later processes the authorization response, it can invoke callbacks_ after the callback owner has been destroyed, causing a use-after-free and process crash under production traffic. The relevant scope boundary is that the vulnerable path uses the HTTP ext_authz client; the advisory does not establish the same trigger for unrelated filters. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.

• CWE-416

• https://github.com/envoyproxy/envoy/commit/8dacef38337aeffd62866b5c5910104b63b33db8
• https://github.com/envoyproxy/envoy/commit/a49085623654e27e9ad6298928557644b849d7ce
• https://github.com/envoyproxy/envoy/commit/c1b29534a294cb0999e99e1fe0de000310165f03
• https://github.com/envoyproxy/envoy/commit/c524571ffad517ba650d9563f85afa89194e2cfb
• https://github.com/envoyproxy/envoy/releases/tag/v1.36.10
• https://github.com/envoyproxy/envoy/releases/tag/v1.37.6
• https://github.com/envoyproxy/envoy/releases/tag/v1.38.4
• https://github.com/envoyproxy/envoy/releases/tag/v1.39.1
• https://github.com/envoyproxy/envoy/security/advisories/GHSA-q8wp-gf7q-m8cv

Published

Sep 21, 2026

Last Modified

Sep 23, 2026

Status

Awaiting Analysis

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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