CVE-2026-91461
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Denial of Service in Oracle Java SE

Publication date: 2026-10-20

Last updated on: 2026-10-24

Assigner: Oracle

Description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of 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, 27; Oracle GraalVM for JDK: 17.0.20.1 and 21.0.12.1; Oracle GraalVM Enterprise Edition: 21.3.19.1.1. Difficult to exploit vulnerability allows unauthenticated attacker with network access via TLS to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: 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. CVSS 3.1 Base Score 3.7 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).

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Meta Information

Published
2026-10-20
Last Modified
2026-10-24
Generated
2026-11-10
AI Q&A
2026-10-21
EPSS Evaluated
2026-11-08
NVD
CVE-2026-91461
EUVD
EUVD-2026-106709

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-295 The product does not validate, or incorrectly validates, a certificate.

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Executive Summary

This is a vulnerability in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition affecting multiple versions. It allows an unauthenticated attacker with network access via TLS to potentially modify some data in these products. The attack is difficult to exploit and requires supplying data to specific APIs without using untrusted Java Web Start or applets.

Detection Guidance

This vulnerability affects Oracle Java SE, GraalVM for JDK, and GraalVM Enterprise Edition components related to JSSE. Detection involves checking installed Java versions against the affected releases (8u503, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27, etc.). Use commands like 'java -version' or 'update-alternatives --config java' to verify versions. Monitor network traffic for unusual TLS interactions targeting these components.

Impact Analysis

If exploited, this vulnerability could allow an attacker to modify some data in Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition. This could lead to unauthorized changes in applications or services using these components, potentially affecting data integrity.

Compliance Impact

This vulnerability could impact compliance by allowing unauthorized data modifications, which may violate integrity requirements in GDPR or HIPAA. Organizations using affected versions must assess potential risks to data protection and integrity controls.

Mitigation Strategies

Update affected Oracle Java SE, GraalVM for JDK, or GraalVM Enterprise Edition versions to the latest patched releases immediately. Disable TLS connections to untrusted sources if possible and monitor for unauthorized data modifications.

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