CVE-2026-107284
AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
CVSS Score
3.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-345 CWE-670 |
| Vendor | asynchttpclient |
| Product | async-http-client |
| Published | Oct 7, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None
Affected Versions
AsyncHttpClient / async-http-client
>= 3.0.0, < 3.0.12 >= 2.0.0, < 2.16.1
References
github.com: https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8 github.com: https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03 github.com: https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9 github.com: https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1 github.com: https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12