CVE-2026-107285: Asynchttpclient Async-HTTP-Client

Medium severity, CVSS 5.9. EPSS: 0.2% chance of exploitation in the next 30 days.

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, a proxied ws request is carried through CONNECT, but NettyRequestFactory.newNettyRequest and requestUri decide whether to attach proxy authentication and an absolute-form target only from whether the URI is secure. Because ws is not marked secure, the tunneled WebSocket upgrade sent to the origin includes the proxy's Proxy-Authorization value. Basic credentials are directly recoverable and Digest responses can be replayed or cracked offline. This issue is fixed in versions 3.0.12 and 2.16.1.

Affected products

• Asynchttpclient Async-HTTP-Client: from 3.0.0, before 3.0.12 (fixed in 3.0.12); from 2.0.0, before 2.16.1 (fixed in 2.16.1)

Published 2026-10-07. Last modified 2026-10-08.