CVE-2026-107284

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.

• https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03
• https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9
• https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
• https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12
• https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8

• https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03
• https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9
• https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1
• https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12
• https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8

• UNSCOREDCVE-2025-12999PoC
• HIGHCVE-2026-100872PoC
• MEDIUMCVE-2026-101278
• MEDIUMCVE-2026-102110PoC
• MEDIUMCVE-2026-102124PoC
• MEDIUMCVE-2026-102140PoC
• UNSCOREDCVE-2026-102250
• HIGHCVE-2026-102267PoC

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