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CVE-2026-55688

CVE-2026-55688 · AsyncHttpClient: Cookie stored for an unrelated domain (cookie tossing) via ThreadSafeCookieStore

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. In versions from 2.0.0 prior to 2.16.0 and from 3.0.0.Beta1 prior to 3.0.11, ThreadSafeCookieStore stored a cookie under the value of its Domain attribute without verifying that the responding host is allowed to set a cookie for that domain, leading to a cookie tossing / cookie injection issue. A host the client connects to can therefore plant a cookie scoped to an unrelated domain, and the client will then send that cookie on later requests to that domain. Applications that use a single AsyncHttpClient instance - and thus the default, shared CookieStore - to reach both an attacker-influenced host and a trusted host are impacted. This issue has been fixed in versions 2.16.0 and 3.0.11.

CVSS 4.0 · Medium · EPSS 0.3% · Fix available

Published
Updated

Stack: system

Affected products and versions

  • async-http-client

    Versions
    • >= 2.0.0, < 2.16.0: Affected
    • >= 3.0.0.Beta1, < 3.0.11: Affected

    No fix published

  • async-http-client Debian:12

    Versions
    • 2.12.3-1
    Affected ranges
    • ECOSYSTEM: < 2.12.3-1+deb12u1

    Update to 2.12.3-1+deb12u1

  • 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
    Affected ranges
    • ECOSYSTEM: < 2.6.0-1ubuntu0.1~esm1

    Update to 2.6.0-1ubuntu0.1~esm1

  • async-http-client Ubuntu:22.04:LTS

    Versions
    • 2.12.2-1
    • 2.12.3-1
    Affected ranges
    • ECOSYSTEM: < 2.12.3-1ubuntu0.22.04.1

    Update to 2.12.3-1ubuntu0.22.04.1

  • async-http-client Ubuntu:24.04:LTS

    Versions
    • 2.12.3-1
    Affected ranges
    • ECOSYSTEM: < 2.12.3-1ubuntu0.24.04.1

    Update to 2.12.3-1ubuntu0.24.04.1

  • async-http-client Ubuntu:25.10

    Versions
    • 2.12.3-1
    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
    Affected ranges
    • ECOSYSTEM: < 2.12.3-1ubuntu1.1

    Update to 2.12.3-1ubuntu1.1

Original sources

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