Bug 2547732 (CVE-2026-107284)

Summary: CVE-2026-107284 org.asynchttpclient/async-http-client: async-http-client: Processing of unverified WebSocket frames via improper handshake validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: gmalinko, janstey, pdelbell, rstepani
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in async-http-client. When initiating a WebSocket connection, the client aborts handshakes that have missing or invalid validation headers but still proceeds to initialize the processing pipeline. A malicious server can exploit this issue by bundling data frames with an invalid handshake response, causing the client to decode and process untrusted messages before the connection terminates.
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Description OSIDB Bzimport 2026-10-07 21:41:33 UTC
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.