1. Ubuntu Security Notices
  2. USN-9015-1

USN-9015-1: OpenJDK 21 vulnerabilities

Publication date

9 November 2026

Overview

Several security issues were fixed in OpenJDK 21.

Releases

Packages

Details

It was discovered that the Security component of OpenJDK 21 did not
correctly authenticate users. A remote attacker could possibly use this
issue to modify sensitive data. (CVE-2026-83374)

It was discovered that the JSSE component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to modify
sensitive data. (CVE-2026-83376)

It was discovered that the Compiler component of OpenJDK 21 did not
correctly authorize users. An unauthenticated remote attacker could
possibly use this issue to read or modify sensitive data. (CVE-2026-83378)

It was discovered that the JAAS component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to read
sensitive data. (CVE-2026-83380)

It was...

It was discovered that the Security component of OpenJDK 21 did not
correctly authenticate users. A remote attacker could possibly use this
issue to modify sensitive data. (CVE-2026-83374)

It was discovered that the JSSE component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to modify
sensitive data. (CVE-2026-83376)

It was discovered that the Compiler component of OpenJDK 21 did not
correctly authorize users. An unauthenticated remote attacker could
possibly use this issue to read or modify sensitive data. (CVE-2026-83378)

It was discovered that the JAAS component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to read
sensitive data. (CVE-2026-83380)

It was discovered that the Security component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to read or modify sensitive data. (CVE-2026-83381)

It was discovered that the JDBC component of OpenJDK 21 did not correctly
authenticate users. A remote attacker could possibly use this issue to read
sensitive data. (CVE-2026-83387)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to cause a denial of service or modify sensitive data. (CVE-2026-83395)

It was discovered that the JAXP component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2026-83400)

It was discovered that the JAXP component of OpenJDK 21 did not correctly
authenticate users. A remote attacker could possibly use this issue to read
sensitive data. (CVE-2026-87290)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authorize users. An unauthenticated remote attacker could
possibly use this issue to read sensitive data. (CVE-2026-87291)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to modify sensitive data. (CVE-2026-87292)

It was discovered that the Security component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to read or modify sensitive data. (CVE-2026-87294)

It was discovered that the JAXP component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to modify
sensitive data. (CVE-2026-87367)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to modify sensitive data. (CVE-2026-91332)

It was discovered that the Security component of OpenJDK 21 did not
correctly authorize users. An unauthenticated remote attacker could
possibly use this issue to read or modify sensitive data. (CVE-2026-91333)

It was discovered that the ImageIO component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to read sensitive data. (CVE-2026-91334)

It was discovered that the AWT component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to read
sensitive data. (CVE-2026-91335)

It was discovered that the JSSE component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2026-91373)

It was discovered that the Serviceability component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to read or modify sensitive data. (CVE-2026-91374)

It was discovered that the Libraries component of OpenJDK 21 did not
correctly authenticate users. A local attacker could possibly use this
issue to modify sensitive data. (CVE-2026-91375)

It was discovered that the JDK tools component of OpenJDK 21 did not
correctly authenticate users. A local attacker could possibly use this
issue to modify sensitive data. (CVE-2026-91379)

It was discovered that the Utility component of OpenJDK 21 did not
correctly authorize users. A local attacker could possibly use this issue
to read or modify sensitive data. (CVE-2026-91380)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authenticate users. A remote attacker could possibly use this
issue to read sensitive data. (CVE-2026-91394)

It was discovered that the Serviceability component of OpenJDK 21 did not
correctly authorize users. A local attacker could possibly use this issue
to cause a denial of service or modify sensitive data. (CVE-2026-91397)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authenticate users. A remote attacker could possibly use this
issue to modify sensitive data. (CVE-2026-91398)

It was discovered that the Sound component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to cause a
denial of service. (CVE-2026-91400)

It was discovered that the JSSE component of OpenJDK 21 did not correctly
authenticate users. A remote attacker could possibly use this issue to read
or modify sensitive data. (CVE-2026-91403)

It was discovered that the Libraries component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to cause a denial of service. (CVE-2026-91410)

It was discovered that the 2D component of OpenJDK 21 did not correctly
authenticate users. A remote attacker could possibly use this issue to
cause a denial of service or read or modify sensitive data.
(CVE-2026-91415)

It was discovered that the ImageIO component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to cause a denial of service. (CVE-2026-91418)

It was discovered that the Networking component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to modify sensitive data. (CVE-2026-91451, CVE-2026-91452)

It was discovered that the Lightweight HTTP Server component of OpenJDK 21
did not correctly authorize users. A remote attacker could possibly use
this issue to modify sensitive data. (CVE-2026-91453)

It was discovered that the JSSE component of OpenJDK 21 did not correctly
authorize users. A remote attacker could possibly use this issue to modify
sensitive data. (CVE-2026-91461)

It was discovered that the JGSS component of OpenJDK 21 did not correctly
authenticate users. A remote attacker could possibly use this issue to
modify sensitive data. (CVE-2026-91462)

It was discovered that the JGSS component of OpenJDK 21 did not correctly
authenticate users. A remote attacker could possibly use this issue to read
sensitive data. (CVE-2026-91463, CVE-2026-91464)

It was discovered that the Compiler component of OpenJDK 21 did not
correctly authorize users. A remote attacker could possibly use this issue
to read or modify sensitive data. (CVE-2026-91487)

It was discovered that the Libraries component of OpenJDK 21 did not
correctly authenticate users. A remote attacker could possibly use this
issue to read or modify sensitive data. (CVE-2026-101516)

It was discovered that the Security component of OpenJDK 21 did not
correctly authenticate users. A remote attacker could possibly use this
issue to read or modify sensitive data. (CVE-2026-114820)

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/2026-10-20
https://openjdk.org/groups/vulnerability/advisories/2026-10-21
https://openjdk.org/groups/vulnerability/advisories/2026-10-24

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.10 stonking openjdk-21-jdk –  21.0.13.0.3+1-1~26.10.1
openjdk-21-jdk-headless –  21.0.13.0.3+1-1~26.10.1
openjdk-21-jre –  21.0.13.0.3+1-1~26.10.1
openjdk-21-jre-headless –  21.0.13.0.3+1-1~26.10.1
openjdk-21-jre-zero –  21.0.13.0.3+1-1~26.10.1
openjdk-21-source –  21.0.13.0.3+1-1~26.10.1
26.04 LTS resolute openjdk-21-jdk –  21.0.13.0.3+1-1~26.04.1
openjdk-21-jdk-headless –  21.0.13.0.3+1-1~26.04.1
openjdk-21-jre –  21.0.13.0.3+1-1~26.04.1
openjdk-21-jre-headless –  21.0.13.0.3+1-1~26.04.1
openjdk-21-jre-zero –  21.0.13.0.3+1-1~26.04.1
openjdk-21-source –  21.0.13.0.3+1-1~26.04.1
24.04 LTS noble openjdk-21-jdk –  21.0.13.0.3+1-1~24.04.1
openjdk-21-jdk-headless –  21.0.13.0.3+1-1~24.04.1
openjdk-21-jre –  21.0.13.0.3+1-1~24.04.1
openjdk-21-jre-headless –  21.0.13.0.3+1-1~24.04.1
openjdk-21-jre-zero –  21.0.13.0.3+1-1~24.04.1
openjdk-21-source –  21.0.13.0.3+1-1~24.04.1
22.04 LTS jammy openjdk-21-jdk –  21.0.13.0.3+1-1~22.04.1
openjdk-21-jdk-headless –  21.0.13.0.3+1-1~22.04.1
openjdk-21-jre –  21.0.13.0.3+1-1~22.04.1
openjdk-21-jre-headless –  21.0.13.0.3+1-1~22.04.1
openjdk-21-jre-zero –  21.0.13.0.3+1-1~22.04.1
openjdk-21-source –  21.0.13.0.3+1-1~22.04.1
20.04 LTS focal openjdk-21-jdk –  21.0.13.0.3+1-1~20.04.1  
openjdk-21-jdk-headless –  21.0.13.0.3+1-1~20.04.1  
openjdk-21-jre –  21.0.13.0.3+1-1~20.04.1  
openjdk-21-jre-headless –  21.0.13.0.3+1-1~20.04.1  
openjdk-21-jre-zero –  21.0.13.0.3+1-1~20.04.1  
openjdk-21-source –  21.0.13.0.3+1-1~20.04.1  

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