UBUNTU-CVE-2026-91403: Critical severity ubuntu/openjdk-8 vulnerability
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: JSSE). Supported versions that are affected are Oracle Java SE: 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, 27.0.1; Oracle GraalVM for JDK: 17.0.21 and 21.0.13; Oracle GraalVM Enterprise Edition: 21.3.20. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized creation, deletion or modification access to critical data or all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data as well as unauthorized access to critical data or complete access to all Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 9.1 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N).
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~16.04.1 - Upgrade
Upgrade
ubuntu/openjdk-ltsto a version that resolves this vulnerability.Fixed in 11.0.33+9-1ubuntu1~18.04.1 - Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~18.04.1 - Upgrade
Upgrade
ubuntu/openjdk-ltsto a version that resolves this vulnerability.Fixed in 11.0.33+9-1ubuntu1~20.04.1 - Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~20.04.1 - Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~22.04.1 - Upgrade
Upgrade
ubuntu/openjdk-ltsto a version that resolves this vulnerability.Fixed in 11.0.33+9-1ubuntu1~22.04.1 - Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~24.04.1 - Upgrade
Upgrade
ubuntu/openjdk-ltsto a version that resolves this vulnerability.Fixed in 11.0.33+9-1ubuntu1~24.04.1 - Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~26.10.1 - Upgrade
Upgrade
ubuntu/openjdk-ltsto a version that resolves this vulnerability.Fixed in 11.0.33+9-1ubuntu1~26.10.1 - Upgrade
Upgrade
ubuntu/openjdk-8to a version that resolves this vulnerability.Fixed in 8u512-b09~us1-0ubuntu1~26.04.1 - Upgrade
Upgrade
ubuntu/openjdk-ltsto a version that resolves this vulnerability.Fixed in 11.0.33+9-1ubuntu1~26.04.1
Event History
Frequently Asked Questions
What deployment patterns should be prioritized for triage?
Prioritize network-reachable applications that use JSSE APIs, especially web services that supply attacker-controlled data to those APIs. Also assess client deployments running sandboxed Java Web Start applications, which are explicitly included.
Does exploitation require an authenticated account or user interaction?
No. The vulnerability is described as easily exploitable by an unauthenticated attacker with network access, with no user interaction required.
Which upstream Java releases are identified as affected?
Affected Oracle Java SE releases are 8u511, 8u511-perf, 11.0.33, 17.0.21, 21.0.13, 25.0.5, and 27.0.1. Affected GraalVM for JDK releases are 17.0.21 and 21.0.13, and affected GraalVM Enterprise Edition is 21.3.20.
What level of access could a successful attacker obtain?
A successful attack can permit creation, deletion, or modification of critical data and access to critical data. It may also result in complete access to data accessible to the affected Java or GraalVM deployment.