USN-8655-1: AsyncHttpClient vulnerability

Publication date

20 August 2026

Overview

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


Packages

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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute libasync-http-client-java –  2.12.3-1ubuntu1.1
24.04 LTS noble libasync-http-client-java –  2.12.3-1ubuntu0.24.04.1
22.04 LTS jammy libasync-http-client-java –  2.12.3-1ubuntu0.22.04.1
20.04 LTS focal libasync-http-client-java –  2.6.0-1ubuntu0.1~esm1  

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