CVE-2026-107227 · GHSA-x8v2-478q-2hvg
AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled
- Risk score
- 62/100
- CVSS
- 7.5 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 7 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 WebSocketClientCom…
- Affected
- org.asynchttpclient:async-http-client (maven) >= 3.0.0, <= 3.0.13; org.asynchttpclient:async-http-client (maven) >= 2.2.0, <= 2.16.1
- Fix
- Upgrade org.asynchttpclient:async-http-client to 3.0.14 or later.
- Exploitation
- No known exploitation
Story map
At a glance
org.asynchttpclient:async-http-client: Amber, patch this week. The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, cross-host request replay updates the current request but leaves the target request and related proxy context pointing at the original origin. Connection-poo…
The flaws
- CVE-2026-107227: AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled (CVSS 7.5 · EPSS 0%)
- CVE-2026-107282: AsyncHttpClient: Replay to a different host sends the original host request and credentials to the new host (CVSS 9.4 · EPSS 0%)
- CVE-2026-107231: AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext (CVSS 8.7 · EPSS 0%)
- CVE-2026-107230: AsyncHttpClient: Pooled connections can still be shared across NTLM, Negotiate and proxy logins (CVSS 7.4 · EPSS 0%)
The fix
Upgrade org.asynchttpclient:async-http-client: 3.0.14 · 3.0.13 · 2.16.1 or later on your release line
Who is exposed: org.asynchttpclient:async-http-client (maven) >= 3.0.0, <= 3.0.12; org.asynchttpclient:async-http-client (maven) >= 2.0.0, <= 2.16.0
Where it stands
- No known exploitation
Connects to
- Same weakness: Denial of service (CWE-400). 257 other warnings in 30 days
Why it is Amber
- CVSS 7.5 high
- Remotely exploitable without logging in
- On your watchlist: Maven
Affected packages
| Package | Ecosystem | Vulnerable | Fixed in |
|---|---|---|---|
| org.asynchttpclient:async-http-client | maven | >= 3.0.0, <= 3.0.13 | 3.0.14 |
| org.asynchttpclient:async-http-client | maven | >= 2.2.0, <= 2.16.1 | No fix yet |
References
- https://github.com/advisories/GHSA-x8v2-478q-2hvg
- https://github.com/AsyncHttpClient/async-http-client/security/advisories/GHSA-x8v2-478q-2hvg
- https://nvd.nist.gov/vuln/detail/CVE-2026-107227
- https://github.com/AsyncHttpClient/async-http-client/commit/b61637f30327f314b7693418f12ce141ac6b2b30
- https://github.com/AsyncHttpClient/async-http-client/releases/tag/async-http-client-project-3.0.14
- https://github.com/advisories/GHSA-x8v2-478q-2hvg
Original description
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.
Last activity 7 Oct 2026. Patch Forecast updates every hour.