5.9
/ 10
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.18.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the router filter contains a null pointer dereference vulnerability when handling HTTP 303 (See Other) internal redirects for body-less non-GET/HEAD requests. When a POST, PUT, DELETE, or PATCH request without a body is sent to a route configured with internal redirect policy that includes 303 in redirect_response_codes, and the upstream responds with HTTP 303, the redirect handling code attempts to drain a request body buffer that was never allocated. This results in a segmentation fault that crashes the entire Envoy process. When route configured with internal_redirect_policy including 303 in redirect_response_codes and upstream must return HTTP 303 response, an unauthenticated attacker can exploit this to cause complete denial of service, terminating all active connections. This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3.
Basic Information
ID
CVE-2026-47221
Source
GitHub_M
Published
Jun 26, 2026 at 17:35
Modified
Jun 26, 2026 at 18:33
Affected Product
Vendor
envoyproxy
Product
envoy
Version
>= 1.38.0, < 1.38.3
Affected Versions
envoyproxy envoy >= 1.38.0, < 1.38.3
envoyproxy envoy >= 1.37.0, < 1.37.5
envoyproxy envoy >= 1.36.0, < 1.36.9
envoyproxy envoy >= 1.18.0, < 1.35.13
envoyproxy envoy >= 1.37.0, < 1.37.5
envoyproxy envoy >= 1.36.0, < 1.36.9
envoyproxy envoy >= 1.18.0, < 1.35.13