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

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-107284

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-107284

async-http-client

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "AsyncHttpClient",
    "product": "async-http-client",
    "versions": [
      {
        "status": "affected",
        "version": ">= 3.0.0, < 3.0.12"
      },
      {
        "status": "affected",
        "version": ">= 2.0.0, < 2.16.1"
      }
    ]
  }
]
Related CVEs
CVE-2026-107284

Source reference: /cveMetadata/cveId

Publisher severity

low

Source reference: /containers/cna/metrics

Event
#12572 · Revision 1
Added to Heist Feed
Publisher date
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