CVE-2026-91373
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Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-22

Assigner: Oracle

Description
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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Meta Information

Published
2026-10-20
Last Modified
2026-10-22
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91373
EUVD
EUVD-2026-106627

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-400 The product does not properly control the allocation and maintenance of a limited resource.

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Executive Summary

This is a vulnerability in Oracle Java SE's JSSE component affecting multiple versions. It allows unauthenticated attackers with network access via TLS to cause a partial denial of service in Oracle Java SE. The attack does not require user interaction or special privileges.

Detection Guidance

Detection involves checking installed Java versions and verifying if they match affected versions. Use commands like 'java -version' to check the version. Monitor network traffic for unusual TLS connections targeting Java services.

Impact Analysis

If you use affected versions of Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition, an attacker could disrupt the availability of Java applications. This may lead to service outages or degraded performance for applications relying on these components.

Compliance Impact

This vulnerability allows unauthorized partial denial of service (DOS) in Oracle Java SE via TLS, which could disrupt services handling sensitive data. While not directly violating GDPR or HIPAA, such disruptions may impact availability of systems processing personal or health data, potentially leading to compliance risks if service levels fall below required standards.

Mitigation Strategies

Apply the latest Oracle Java SE patches immediately. Disable Java Web Start applications and untrusted Java applets if not required. Restrict network access to Java services via firewalls.

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