Live › vulnerability › CVE-2026-91373
Go to dashboardA flaw in the JSSE TLS component of Oracle Java SE lets a remote, unauthenticated attacker over TLS cause a partial denial of service. The sources score it as availability-only impact with no confidentiality or integrity loss.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 21:57 UTC. All times on this page are UTC.
Systems running an affected Oracle Java SE or GraalVM build that accept TLS connections from untrusted networks, such as web services that feed data into JSSE APIs. Client deployments running sandboxed Web Start apps or applets that load untrusted code are also named in the sources. Systems with no exposed TLS listener on an affected build can deprioritize this.
No product ranges from the sources yet.
java -version and compare against the affected builds: Java SE 8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, GraalVM for JDK 17.0.20.1 and 21.0.12.1, GraalVM Enterprise 21.3.19.1.1.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
Vulnerability in Oracle Java SE (component: JSSE). 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; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via TLS to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE. 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).
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