CVE-2026-107284lowCWE-345CWE-670

CVE-2026-107284: low-severity vulnerability in AsyncHttpClient async-http-client

AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check

Published

5Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 3.7
exploitation probability
—
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
Affected products
AsyncHttpClient · async-http-client
Related CVEs — AsyncHttpClient async-http-client

In the same product, most dangerous first.

CVE-2024-53990CRITICALAsyncHttpClient (AHC) library's `CookieStore` replaces explicitly defined `Cookie`sEPSS 0.6%CVE-2026-85721HIGHAsyncHttpClient: Unbounded HTTP/1.1 response decompression enables a decompression-bomb denial of serviceEPSS 0.6%CVE-2026-85718MEDIUMAsyncHttpClient: Connection permit leak on TLS handshake failure causes per-host denial of serviceEPSS 0.5%CVE-2026-85717MEDIUMAsyncHttpClient: Client-wide realm credentials re-sent to a cross-origin redirect targetEPSS 0.5%CVE-2026-40490MEDIUMAsyncHttpClient leaks authorization credentials to untrusted domains on cross-origin redirectsEPSS 0.5%CVE-2026-45300HIGHasync-http-client: Cookie header not stripped on cross-origin redirectEPSS 0.5%
References
https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8