Home / mailings [USN-8003-1] CRaC JDK 21 vulnerabilities
Posted on 03 February 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8003-1
February 02, 2026
openjdk-21-crac vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 25.10
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)
Ireneusz Pastusiak discovered that the Security component of CRaC JDK
21 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-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
Package Information:
https://launchpad.net/ubuntu/+source/openjdk-21-crac/21.0.10+7-0ubuntu1~25.10
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