Disclosure summary
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. From 2.2.0 until 3.0.14, WebSocket permessage-deflate decompression is unbounded when compression is enabled. The inbound pipeline aggregates compressed frames before WebSocketClientCompressionHandler inflates them, so webSocketMaxFrameSize and webSocketMaxBufferSize do not bound decompressed output. A malicious WebSocket peer can send a small compressed message that expands to a very large Netty buffer and exhausts JVM heap. This issue is fixed in version 3.0.14.
Source-reported weakness categories
CWE-400, CWE-409
Source-specific records & product guidance
Sources retain their own attribution and scoring. Follow the original record to confirm affected versions, fixed releases, and configuration conditions.
NIST National Vulnerability Database · NVD-CVE-2026-107227
Open original source · Updated Oct 08, 2026
Only CPE matches marked vulnerable=true are indexed. AND/OR platform conditions must be checked in the original NVD record.
GitHub Reviewed Security Advisories · GHSA-x8v2-478q-2hvg
Open original source · Updated Oct 08, 2026
AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled
Source severity: HIGH / 0
| Ecosystem | Package | Affected range | First patched |
|---|---|---|---|
| maven | org.asynchttpclient:async-http-client | >= 3.0.0, | 3.0.14 |
| maven | org.asynchttpclient:async-http-client | >= 2.2.0, | Not supplied |
Original records & references
PUBLISHED 2026-10-07T17:17:14-04:00
MODIFIED 2026-10-08T16:35:31-04:00
INGESTED 2026-10-10T20:50:46-04:00