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[USN-7885-1] OpenJDK 21 vulnerabilities

Posted on 25 November 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7885-1
November 24, 2025

openjdk-21 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in OpenJDK 21.

Software Description:
- openjdk-21: Open Source Java implementation

Details:

Jinfeng Guo discovered that the Security component of OpenJDK 21 did not
correctly handle certain representations of encoded strings. An
unauthenticated remote attacker could possibly use this issue to modify
files or leak sensitive information. (CVE-2025-53057)

Darius Bohni discovered that the JAXP component of OpenJDK 21 was
vulnerable to a XML External Entity (XEE) attack. An unauthenticated remote
attacker could possibly use this issue to modify files or leak sensitive
information. (CVE-2025-53066)

Yakov Shafranovich discovered that the Libraries component of OpenJDK 21
contained an issue where certain Strings built with StringBuilder returned
an incorrect result for String.equals() checks. An unauthenticated remote
attacker could possibly use this issue to update, insert, or delete
accessible data. (CVE-2025-61748)

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/2025-10-21

Update instructions:

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

Ubuntu 25.10
openjdk-21-jdk 21.0.9+10-1~25.10
openjdk-21-jdk-headless 21.0.9+10-1~25.10
openjdk-21-jre 21.0.9+10-1~25.10
openjdk-21-jre-headless 21.0.9+10-1~25.10
openjdk-21-jre-zero 21.0.9+10-1~25.10

Ubuntu 25.04
openjdk-21-jdk 21.0.9+10-1~25.04
openjdk-21-jdk-headless 21.0.9+10-1~25.04
openjdk-21-jre 21.0.9+10-1~25.04
openjdk-21-jre-headless 21.0.9+10-1~25.04
openjdk-21-jre-zero 21.0.9+10-1~25.04

Ubuntu 24.04 LTS
openjdk-21-jdk 21.0.9+10-1~24.04
openjdk-21-jdk-headless 21.0.9+10-1~24.04
openjdk-21-jre 21.0.9+10-1~24.04
openjdk-21-jre-headless 21.0.9+10-1~24.04
openjdk-21-jre-zero 21.0.9+10-1~24.04

Ubuntu 22.04 LTS
openjdk-21-jdk 21.0.9+10-1~22.04
openjdk-21-jdk-headless 21.0.9+10-1~22.04
openjdk-21-jre 21.0.9+10-1~22.04
openjdk-21-jre-headless 21.0.9+10-1~22.04
openjdk-21-jre-zero 21.0.9+10-1~22.04

Ubuntu 20.04 LTS
openjdk-21-jdk 21.0.9+10-1~20.04
Available with Ubuntu Pro
openjdk-21-jdk-headless 21.0.9+10-1~20.04
Available with Ubuntu Pro
openjdk-21-jre 21.0.9+10-1~20.04
Available with Ubuntu Pro
openjdk-21-jre-headless 21.0.9+10-1~20.04
Available with Ubuntu Pro
openjdk-21-jre-zero 21.0.9+10-1~20.04
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-7885-1
CVE-2025-53057, CVE-2025-53066, CVE-2025-61748

Package Information:
https://launchpad.net/ubuntu/+source/openjdk-21/21.0.9+10-1~25.10
https://launchpad.net/ubuntu/+source/openjdk-21/21.0.9+10-1~25.04
https://launchpad.net/ubuntu/+source/openjdk-21/21.0.9+10-1~24.04
https://launchpad.net/ubuntu/+source/openjdk-21/21.0.9+10-1~22.04

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