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[USN-8655-1] AsyncHttpClient vulnerability

Posted on 24 August 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8655-1
August 20, 2026

async-http-client vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

AsyncHttpClient could be made to expose sensitive information over the
network.

Software Description:
- async-http-client: Java Asynchronous HTTP Client

Details:

It was discovered that AsyncHttpClient did not properly verify that the
responding host was allowed to set cookies for a given domain in its
ThreadSafeCookieStore. An attacker could use this to plant cookies scoped to
unrelated domains, which would then be sent on later requests to those
domains.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
libasync-http-client-java 2.12.3-1ubuntu1.1

Ubuntu 24.04 LTS
libasync-http-client-java 2.12.3-1ubuntu0.24.04.1

Ubuntu 22.04 LTS
libasync-http-client-java 2.12.3-1ubuntu0.22.04.1

Ubuntu 20.04 LTS
libasync-http-client-java 2.6.0-1ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8655-1
CVE-2026-55688

Package Information:
https://launchpad.net/ubuntu/+source/async-http-client/2.12.3-1ubuntu1.1
https://launchpad.net/ubuntu/+source/async-http-client/2.12.3-1ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/async-http-client/2.12.3-1ubuntu0.22.04.1

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