CVE Watch28 oct 2026

CVE-2026-118264

Echo is a Go web framework. From 4.0.0 until 4.16.1 and 5.4.1, Echo's Proxy middleware selects a raw tunnel from a client WebSocket upgrade

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 28 oct 2026 · Última mod.: 28 oct 2026 · CWE-444 · CWE-863

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

Echo is a Go web framework. From 4.0.0 until 4.16.1 and 5.4.1, Echo's Proxy middleware selects a raw tunnel from a client WebSocket upgrade request before verifying that the configured upstream accepted the upgrade. If the upstream rejects the upgrade with an ordinary keep-alive response, later HTTP requests on the connection are sent directly to that upstream without passing through Echo's router or route-specific middleware. This can bypass authentication or authorization enforced only by Echo routes, but requires an accessible proxy route, a cooperating rejected-upgrade response, and a target without independent upstream authorization. This issue is fixed in 4.16.1 and 5.4.1.

Referencias oficiales

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