https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-10-10T17:11:55.288492+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/ghsa-4mp9-239f-g9hg GHSA-4mp9-239f-g9hg — Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation 2026-10-10T17:11:55.409466+00:00

Affected: Maven: io.netty:netty-codec-http

## 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.