GHSA-4mp9-239f-g9hg
Netty: WebSockets V07/V08 handshaker missing Connection/Upgrade validation
At a glance
- Published
- Updated
- CVE
- CVE-2026-59898
- CVSS_V4
- CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Description
## 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.
Affected packages
| Package | Versions |
|---|---|
| Maven · io.netty:netty-codec-http | introduced 4.2.0.Final, fixed 4.2.16.Final |
| Maven · io.netty:netty-codec-http | introduced 0, fixed 4.1.136.Final |
References
- https://github.com/netty/netty/security/advisories/GHSA-4mp9-239f-g9hg WEB
- https://github.com/netty/netty PACKAGE
- https://github.com/netty/netty/releases/tag/netty-4.1.136.Final WEB
- https://github.com/netty/netty/releases/tag/netty-4.2.16.Final WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |