CVE-2026-107227

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductOrg.asynchttpclient:async-http-client

PublishedOct 7, 2026

First seenOct 7, 2026

Weakness typeCWE-400Uncontrolled resource consumption CWE-409CWE-409

How to fix

Update

org.asynchttpclient:async-http-client3.0.14 or later

Affected products

Product	Affected versions	Fixed in
org.asynchttpclient:async-http-clientMaven	3.0.0 ≤ v < 3.0.14, 2.2.0 ≤ v ≤ 2.16.1	3.0.14

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.