CVE-2026-21945
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
A vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition (component: Security) allows an unauthenticated attacker with network access to cause a complete denial of service (DOS) via a hang or frequently repeatable crash. Affected versions include Java SE 8u471, 11.0.29, 17.0.17, 21.0.9, 25.0.1 and corresponding GraalVM versions.
Risk Assessment
The risk is remote disruption of Java applications running in sandboxed environments (e.g., Java Web Start, applets), potentially leading to downtime of critical services.
Recommendation
Apply the patches provided by Oracle for affected Java SE and GraalVM versions immediately, and restrict execution of untrusted Java code in production environments.
Other vulnerabilities in Oracle Java SE
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- CVE-2016-3449High
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- CVE-2015-0412High
Unspecified vulnerability in Oracle Java SE 6u85, 7u72, and 8u25 allows remote attackers to affect confidentiality, integrity, and availability via vectors related to JAX-WS.
- CVE-2015-0395High
Unspecified vulnerability in Oracle Java SE 5.0u75, 6u85, 7u72, and 8u25 allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors related to Hotspot.
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- CVE-2014-6562High
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- CVE-2014-6492High
Unspecified vulnerability in Oracle Java SE 6u81, 7u67, and 8u20, when running on Firefox, allows remote attackers to affect confidentiality, integrity, and availability via unknown vectors related to Deployment.
Original NVD description (English source)
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Security). Supported versions that are affected are Oracle Java SE: 8u471, 8u471-b50, 8u471-perf, 11.0.29, 17.0.17, 21.0.9, 25.0.1; Oracle GraalVM for JDK: 17.0.17 and 21.0.9; Oracle GraalVM Enterprise Edition: 21.3.16. 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 ability to cause a hang or frequently repeatable crash (complete DOS) of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Note: This vulnerability 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. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted code (e.g., code installed by an administrator). CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).