All vulnerabilities
CVE-2026-107284GHSA-rwhr-j9rv-85f8

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

AsyncHttpClient async-http-client
Open in ThreatlineRecord JSON
CVSS
3.7Low
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.14%Chance of exploitation activity in the next 30 days, higher than 2% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
Published7 Oct 2026Updated 8 Oct 2026CVE List

What fixes it

No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.

Description

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.

Text from CVE List

Affected versions 2

  • async-http-clientaffected: >= 3.0.0, < 3.0.12CVE List
  • async-http-clientaffected: >= 2.0.0, < 2.16.1CVE List

References 5