Open-source package vulnerability · Oracle

CVE-2026-91484: Oracle Java SE Java plugin vulnerability (CVE-2026-91484)

highCVSS 3.1 7.5

Published Oct 20, 2026

Advisory details

From the National Vulnerability Database. This product uses the NVD API but is not endorsed or certified by the NVD.

Vulnerability in Oracle Java SE (component: Java plugin). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf. Not remotely exploitable without authentication. CVSS 3.1 base score 7.5 (confidentiality, integrity impact). 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). Fixed in the Oracle Critical Patch Update of October 20, 2026 and the matching OpenJDK update releases; OpenJDK lists 26.0.2.1, 25.0.4.1, 21.0.12.1, 17.0.20.1, 11.0.32.1, 8u504 and earlier as affected.

References

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

Coverage on the Beam blog

Oracle Java SE October 2026 CPU and OpenJDK Advisory: 55 Java Fixes, 49 Remotely Exploitable, What to Patch First

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