==========================================================================
Ubuntu Security Notice USN-7998-1
February 03, 2026

openjdk-17 vulnerabilities
==========================================================================

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

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in OpenJDK 17.

Software Description:
- openjdk-17: Open Source Java implementation

Details:

It was discovered that the RMI component of OpenJDK 17 would establish
RMI TCP endpoint connections to a remote host without setting an
endpoint identification algorithm. An unauthenticated remote attacker
could possibly use this issue to steal sensitive information.
(CVE-2026-21925)

Mingijung discovered that the AWT and JavaFX componenets of OpenJDK 17
could run programs if Desktop.browse() was supplied a filename as a
URI. An unauthenticated remote attacker could possibly use this issue
to execute arbitrary code. (CVE-2026-21932)

Zhihui Chen discovered that the Networking component of OpenJDK 17
was suceptible to a CRLF injection vulnerability via the HttpServer
class. An unauthenticated remote attacker could possibly use this
issue to modify files or leak sensitive information. (CVE-2026-21933)

Ireneusz Pastusiak discovered that the Security component of OpenJDK
17 failed to verify provided URIs point to a legitimate source when
AIA is enabled. An unauthenticated remote attacker could possibly
use this issue to redirect users to malicious hosts.
(CVE-2026-21945)

In addition to security fixes, the updated packages contain bug fixes,
new features, and possibly incompatible changes.

Please see the following for more information:
https://openjdk.org/groups/vulnerability/advisories/2026-01-20

Update instructions:

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

Ubuntu 25.10
  openjdk-17-jdk                  17.0.18+8-1~25.10.1
  openjdk-17-jdk-headless         17.0.18+8-1~25.10.1
  openjdk-17-jre                  17.0.18+8-1~25.10.1
  openjdk-17-jre-headless         17.0.18+8-1~25.10.1
  openjdk-17-jre-zero             17.0.18+8-1~25.10.1

Ubuntu 24.04 LTS
  openjdk-17-jdk                  17.0.18+8-1~24.04.1
  openjdk-17-jdk-headless         17.0.18+8-1~24.04.1
  openjdk-17-jre                  17.0.18+8-1~24.04.1
  openjdk-17-jre-headless         17.0.18+8-1~24.04.1
  openjdk-17-jre-zero             17.0.18+8-1~24.04.1

Ubuntu 22.04 LTS
  openjdk-17-jdk                  17.0.18+8-1~22.04.1
  openjdk-17-jdk-headless         17.0.18+8-1~22.04.1
  openjdk-17-jre                  17.0.18+8-1~22.04.1
  openjdk-17-jre-headless         17.0.18+8-1~22.04.1
  openjdk-17-jre-zero             17.0.18+8-1~22.04.1

Ubuntu 20.04 LTS
  openjdk-17-jdk                  17.0.18+8-1~20.04
                                  Available with Ubuntu Pro
  openjdk-17-jdk-headless         17.0.18+8-1~20.04
                                  Available with Ubuntu Pro
  openjdk-17-jre                  17.0.18+8-1~20.04
                                  Available with Ubuntu Pro
  openjdk-17-jre-headless         17.0.18+8-1~20.04
                                  Available with Ubuntu Pro
  openjdk-17-jre-zero             17.0.18+8-1~20.04
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  openjdk-17-jdk                  17.0.18+8-1~18.04
                                  Available with Ubuntu Pro
  openjdk-17-jdk-headless         17.0.18+8-1~18.04
                                  Available with Ubuntu Pro
  openjdk-17-jre                  17.0.18+8-1~18.04
                                  Available with Ubuntu Pro
  openjdk-17-jre-headless         17.0.18+8-1~18.04
                                  Available with Ubuntu Pro
  openjdk-17-jre-zero             17.0.18+8-1~18.04
                                  Available with Ubuntu Pro

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart Java
applications to make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-7998-1
  CVE-2026-21925, CVE-2026-21932, CVE-2026-21933, CVE-2026-21945

Package Information:
  https://launchpad.net/ubuntu/+source/openjdk-17/17.0.18+8-1~25.10.1
  https://launchpad.net/ubuntu/+source/openjdk-17/17.0.18+8-1~24.04.1