CVE-2026-73548 | 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 forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts the upgrade. An unauthenticated HTTP/2 client can place a complete HTTP/1.1 request in extended CONNECT data; Envoy downgrades the request, writes the data unframed to a keep-alive HTTP/1.1 upstream, and returns the socket to the shared p
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 forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts the upgrade. An unauthenticated HTTP/2 client can place a complete HTTP/1.1 request in extended CONNECT data; Envoy downgrades the request, writes the data unframed to a keep-alive HTTP/1.1 upstream, and returns the socket to the shared pool while the smuggled response remains queued. A different downstream client can then receive the attacker's response. The relevant scope boundary is that webSocket upgrades, plain CONNECT, disabled backend keep-alive, per-downstream pools, and max_requests_per_connection set to 1 are not affected by the demonstrated path. This issue is fixed in versions 1.36.10, 1.37.6, 1.38.4, and 1.39.1.
- 🔗 github.com/envoyproxy/envoy/security/advisories/GHSA…
- 🔗 github.com/envoyproxy/envoy/commit/309855626966cff17…
- 🔗 github.com/envoyproxy/envoy/commit/3c7998545a9c9fb39…
- 🔗 github.com/envoyproxy/envoy/commit/4633b8cce3d15b873…
- 🔗 github.com/envoyproxy/envoy/commit/bd6711f2617658e28…
- 🔗 github.com/envoyproxy/envoy/releases/tag/v1.36.10
- 🔗 github.com/envoyproxy/envoy/releases/tag/v1.37.6
- 🔗 github.com/envoyproxy/envoy/releases/tag/v1.38.4
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| Tier | 2026-09-04 | 2026-09-21 |
|---|---|---|
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| ≥10 % | 0 | 7 |
| <10 % | 300 | 0 |
CVE-2026-73548 | 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 forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts the upgrade. An unauthenticated HTTP/2 client can place a complete HTTP/1.1 request in extended CONNECT data; Envoy downgrades the request, writes the data unframed to a keep-alive HTTP/1.1 upstream, and returns the socket to the shared p
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 forwards data for a configured non-WebSocket HTTP upgrade before the upstream accepts the upgrade. An
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