Description
Envoy is a high-performance edge/middle/service proxy. Prior to 1.37.1, 1.36.5, 1.35.8, and 1.34.13, At the rate limit filter, if the response phase limit with apply_on_stream_done in the rate limit configuration is enabled and the response phase limit request fails directly, it may crash Envoy. When both the request phase limit and response phase limit are enabled, the safe gRPC client instance will be re-used for both the request phase request and response phase request. But after the request phase request is done, the inner state of the request phase limit request in gRPC client is not cleaned up. When a second limit request is sent at response phase, and the second limit request fails directly, the previous request's inner state may be accessed and result in crash. This vulnerability is fixed in 1.37.1, 1.36.5, 1.35.8, and 1.34.13.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| envoyproxy | envoy | >= 1.37.0, < 1.37.1, >= 1.36.0, < 1.36.5, >= 1.35.0, < 1.35.9, < 1.34.13 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | ecs-service-connect-agent | v1.34.13.0-1.amzn2023 | ALAS2023-2026-1532 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | github.com/envoyproxy/envoy | 1.37.0 | — | GHSA-c23c-rp3m-vpg3 |
| Go | github.com/envoyproxy/envoy | >= 1.36.0, <= 1.36.4 | — | GHSA-c23c-rp3m-vpg3 |
Advisories 2
- WID-SEC-2026-0704 Google Cloud Platform Envoy Proxy, Istio und Service Mesh: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 1, 2026
- ALAS2023-2026-1532 Important: ecs-service-connect-agent security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Apr 1, 2026