CVE-2026-107284CWE-345CWE-670

CVE-2026-107284

Low · published October 8, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
2.9
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.00138 · 2.9th percentile
Weaknesses
CWE-345 · Insufficient Verification of Data Authenticity; CWE-670 · Always-Incorrect Control Flow Implementation
Published
2026-10-08T02:17Z
References (5)
https://github.com/AsyncHttpClient/async-http-client/commit/75a278550aa9a980009d022fb4e635f9c8738c03 · [email protected]https://github.com/AsyncHttpClient/async-http-client/commit/ccdcaa627db6d96dcc42105212cb3ba5048bd7f9 · [email protected]https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-2.16.1 · [email protected]https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.12 · [email protected]https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-rwhr-j9rv-85f8 · [email protected]
EPSS history
Timeline
  • 09 OCT 03:26Z
    EPSS moved — → 0%
    epss
  • 07 OCT 21:27Z
    AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
    cvelistv5
  • 07 OCT 21:27Z
    AsyncHttpClient: WebSocket handshake continues after a failed Sec-WebSocket-Accept check
    cvelistv5