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[USN-8430-1] ADSys vulnerabilities

Posted on 16 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8430-1
June 15, 2026

adsys vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in ADSys.

Software Description:
- adsys: Active Directory Group Policy client

Details:

It was discovered that ADSys did not properly handle certain HTTP/2 frames.
A remote attacker could possibly use this issue to cause a denial of
service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-27141)

It was discovered that ADSys did not properly handle certain HTTP/2
SETTINGS frames. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2026-33814)

Update instructions:

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

Ubuntu 26.04 LTS
adsys 0.16.4ubuntu1.1

Ubuntu 25.10
adsys 0.16.3ubuntu0.25.10.2

Ubuntu 24.04 LTS
adsys 0.16.3~24.04.2ubuntu0.24.04.1

Ubuntu 22.04 LTS
adsys 0.16.3~22.04.2ubuntu0.22.04.1

Ubuntu 20.04 LTS
adsys 0.9.2~20.04.2ubuntu0.1+esm2
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8430-1
CVE-2026-27141, CVE-2026-33814

Package Information:
https://launchpad.net/ubuntu/+source/adsys/0.16.4ubuntu1.1
https://launchpad.net/ubuntu/+source/adsys/0.16.3ubuntu0.25.10.2
https://launchpad.net/ubuntu/+source/adsys/0.16.3~24.04.2ubuntu0.24.04.1
https://launchpad.net/ubuntu/+source/adsys/0.16.3~22.04.2ubuntu0.22.04.1

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