Oracle Java SE/GraalVM for JDK/GraalVM Enterprise Edition JSSE denial of service

Summaryinfo

A vulnerability was found in Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition and classified as problematic. The affected element is an unknown function of the component JSSE. Such manipulation leads to denial of service. This vulnerability is listed as CVE-2026-22021. The attack may be performed from remote. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Oracle Java SE, GraalVM for JDK and GraalVM Enterprise Edition (the affected version is unknown) and classified as problematic. Affected by this issue is an unknown code of the component JSSE. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. CVE summarizes:

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: 8u481, 8u481-b50, 8u481-perf, 11.0.30, 17.0.18, 21.0.10, 25.0.2, 26; Oracle GraalVM for JDK: 17.0.18 and 21.0.10; Oracle GraalVM Enterprise Edition: 21.3.17. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTPS to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. 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 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).

The advisory is shared for download at oracle.com. This vulnerability is handled as CVE-2026-22021 since 01/05/2026. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 06/12/2026). The MITRE ATT&CK project declares the attack technique as T1499.

The vulnerability scanner Nessus provides a plugin with the ID 309659 (RHEL 7 / 8 / 9 : Java 11 OpenJDK ELS Security Update (Important) (RHSA-2026:9254)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (309659) and CERT Bund (WID-SEC-2026-1201). Once again VulDB remains the best source for vulnerability data.

Affected

• Debian Linux
• IBM Tivoli Monitoring
• Amazon Linux 2
• Open Source OpenJDK
• Red Hat Enterprise Linux
• Ubuntu Linux
• IBM WebSphere Application Server
• SUSE Linux
• IBM Tivoli Netcool/OMNIbus
• Oracle Linux
• IBM Rational Software Architect
• IBM TXSeries
• IBM InfoSphere Information Server
• IBM Content Manager
• SUSE openSUSE
• RESF Rocky Linux
• NetApp ActiveIQ Unified Manager
• Azul Zulu
• IBM Semeru Runtime
• Open Source Camunda
• IBM App Connect Enterprise
• Oracle Java SE
• Oracle GraalVM
• IBM Java
• IBM Business Automation Workflow
• RealObjects PDFreactor
• IBM Rational Application Developer for WebSphere Software
• IBM WebSphere Service Registry and Repository
• IBM Tivoli Network Manager

Productinfo

Type

• Programming Language Software

Vendor

• Oracle

Name

• GraalVM Enterprise Edition
• GraalVM for JDK
• Java SE

License

• open-source

Website

• Vendor: https://www.oracle.com

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Once again VulDB remains the best source for vulnerability data.

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