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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products
envoyproxy:envoy
References 9
https://github.com/envoyproxy/envoy/commit/8dacef38337aeffd62866b5c5910104b63b3…
security-advisories@github.com
https://github.com/envoyproxy/envoy/commit/a49085623654e27e9ad6298928557644b849…
security-advisories@github.com
https://github.com/envoyproxy/envoy/commit/c1b29534a294cb0999e99e1fe0de00031016…
security-advisories@github.com
https://github.com/envoyproxy/envoy/commit/c524571ffad517ba650d9563f85afa89194e…
security-advisories@github.com
https://github.com/envoyproxy/envoy/releases/tag/v1.36.10
security-advisories@github.com
https://github.com/envoyproxy/envoy/releases/tag/v1.37.6
security-advisories@github.com
https://github.com/envoyproxy/envoy/releases/tag/v1.38.4
security-advisories@github.com
https://github.com/envoyproxy/envoy/releases/tag/v1.39.1
security-advisories@github.com
https://github.com/envoyproxy/envoy/security/advisories/GHSA-q8wp-gf7q-m8cv
security-advisories@github.com