Envoy : Use After Free Vulnerability - 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 Envoys 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 vu