CVE-2026-107284 — AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandle…
Published: 2026-10-07 · CVSS: 3.7 · CVSS 3.1
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.12 and 2.16.1, WebSocketHandler.upgrade aborts a handshake whose Sec-WebSocket-Accept value is missing or invalid but continues into pipeline installation and onOpen delivery. Frames coalesced with the invalid 101 response can be decoded and delivered from a peer that did not prove the handshake, although the request future fails and the channel closes. This issue is fixed in versions 3.0.12 and 2.16.1.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7