Open-source package vulnerability · Oracle

CVE-2026-91452: Oracle Java SE Networking vulnerability (CVE-2026-91452)

mediumCVSS 3.1 5.3

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, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition (component: Networking). Supported versions that are affected are Oracle Java SE: 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27; Oracle GraalVM for JDK: 17.0.20.1, 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Exploitable remotely without authentication via multiple protocols. CVSS 3.1 base score 5.3 (integrity impact). OpenJDK component: core-libs/java.net. This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. 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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