CVE-2026-107284AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
Updated under an hour ago ()
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It affects AsyncHttpClient async-http-client. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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
- 3.7 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-345, CWE-670
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 8, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
AsyncHttpClient async-http-client asynchttpclient:async_http_client (from the name) | from 3.0.0, < 3.0.12; from 2.0.0, < 2.16.1 | CNA record |
References
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8x-refsource-confirm
- https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03x-refsource-misc
- https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9x-refsource-misc
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1x-refsource-misc
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12x-refsource-misc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.