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Ubuntu 25.10 OpenJDK-21-crac Important Remote Access Threat USN-8003-1

ubuntu
Calendar Grey February 3, 2026
Dist Ubuntu Esm H88
Critical issues in Ubuntu's openjdk-21-crac could lead to remote attacks or arbitrary code execution risks.
Several security issues were fixed in CRaC JDK 21.

Summary

Several security issues were fixed in CRaC JDK 21.

Software Description:

- openjdk-21-crac: Open Source Java implementation with Coordinated Restore at Checkpoints

Details:

It was discovered that the RMI component of CRaC JDK 21 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 CRaC JDK 21

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 CRaC JDK 21

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)

Irene...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu important execution risk openjdk-21-crac

Update Instructions

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

Ubuntu 25.10
  openjdk-21-crac-demo            21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-doc             21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-jdk             21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-jdk-headless    21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-jre             21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-jre-headless    21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-jre-zero        21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-source          21.0.10+7-0ubuntu1~25.10
  openjdk-21-crac-testsupport     21.0.10+7-0ubuntu1~25.10

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-8003-1

CVE-2026-21925, CVE-2026-21932, CVE-2026-21933, CVE-2026-21945

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8003-1

Topics%20covered

Topics Covered

security advisory remote attack Ubuntu important execution risk openjdk-21-crac

Package Information

https://launchpad.net/ubuntu/+source/openjdk-21-crac/21.0.10+7-0ubuntu1~25.10

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