CVE-2026-59898

ADVISORY - github

Summary

An attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending Sec-WebSocket-Version: 7 and omitting Connection: Upgrade / Upgrade: websocket headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks.

Common Weakness Enumeration (CWE)

ADVISORY - github

CWE-444⁠

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

Impacted images

Advisories

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