# CVE-2026-91380: Oracle Java SE data access vulnerability in Utility component

Source: https://junglewise.ai/threats/cve-2026-91380-vulnerability-in-the-oracle-java-se-oracle-graalvm-for-jdk-oracle  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-91380 · Severity: medium · CVSS 4 · Published 2026-10-20

Oracle Java SE and related products contain a vulnerability in the Utility component that allows a local attacker with logon access to read, modify, or delete sensitive data. The vulnerability affects multiple Java SE versions, GraalVM for JDK, and GraalVM Enterprise Edition. An attacker could exploit this through APIs or web services to gain unauthorized access to application data.

Technologies: [Oracle GraalVM Enterprise Edition](https://junglewise.ai/threats/technologies/graalvm-enterprise-edition), [Oracle Graalvm For Jdk](https://junglewise.ai/threats/technologies/graalvm-for-jdk), [Oracle Java SE](https://junglewise.ai/threats/technologies/java-se). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## Quick answers

**Is CVE-2026-91380 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-91380 being exploited in the wild.

**How severe is CVE-2026-91380?** Medium severity, with a CVSS score of 4, published 20 October 2026.

**Which products and versions are affected?** Oracle GraalVM Enterprise Edition 21.3.19.1.1; Oracle Graalvm For Jdk 17.0.20.1, 21.0.12.1; Oracle Java SE 8u503, 8u503-perf, 11.0.32.1, 17.0.20.1, 21.0.12.1, 25.0.4.1, 27.

**Is there a fix for CVE-2026-91380?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-91380 attacked?** It is attacked with local access, in a software library.

**Am I affected by CVE-2026-91380?** Check whether you run Oracle GraalVM Enterprise Edition, Oracle Graalvm For Jdk or Oracle Java SE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A difficult-to-exploit local vulnerability in the Utility component of Oracle Java SE allows unauthenticated attackers with infrastructure logon access to compromise data confidentiality and integrity. The attack requires local access and may be exploited via APIs or through web services that supply data to vulnerable components. Exploitation results in unauthorized read, update, insert, or delete access to accessible data.

## Affected products

- 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

## Timeline

- 2026-10-20: disclosed

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