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CVE-2026-107227

CVE-2026-107227 · AsyncHttpClient: Unbounded WebSocket permessage-deflate decompression enables a decompression-bomb denial of service when compression is enabled

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 7.5 · High · EPSS 0.4%

Published
Updated

Stack: system

Affected products and versions

  • async-http-client

    Versions
    • >= 3.0.0, < 3.0.14: Affected
    • >= 2.2.0, <= 2.16.1: Affected

    No fix published

  • async-http-client Debian:12

    Versions
    • 2.12.3-1
    • 2.12.3-1+deb12u1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:Pro:14.04:LTS

    Versions
    • 1.6.5-1
    • 1.6.5-2
    • 1.6.5-2ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:16.04:LTS

    Versions
    • 1.6.5-4
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:18.04:LTS

    Versions
    • 1.6.5-4
    • 1.6.5-5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:Pro:20.04:LTS

    Versions
    • 2.6.0-1
    • 2.6.0-1ubuntu0.1~esm1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:22.04:LTS

    Versions
    • 2.12.2-1
    • 2.12.3-1
    • 2.12.3-1ubuntu0.22.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:24.04:LTS

    Versions
    • 2.12.3-1
    • 2.12.3-1ubuntu0.24.04.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:26.10

    Versions
    • 2.12.3-1ubuntu1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • async-http-client Ubuntu:26.04:LTS

    Versions
    • 2.12.3-1
    • 2.12.3-1ubuntu1
    • 2.12.3-1ubuntu1.1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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