CVE-2026-73548

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W Envoy nieautoryzowany klient HTTP/2 może przeprowadzić atak typu response smuggling.

CVSS
7.5
EPSS
0.5%
Exploit
poc
Vendor
envoyproxy
Opis źródłowy (NVD)

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.

exploit Brak patcha
Źródła i daty
ŹródłoWartość
NVD – CVSS7.5
CISA KEV (aktywnie wykorzystywane)Nie
FIRST EPSS (prawdopodobieństwo exploita)0.5%
Opublikowano (NVD)2026-09-21 20:17:28 UTC
Ostatnia modyfikacja (NVD)2026-10-05 14:19:45 UTC
Referencje