CVE-2026-91335 Oracle Corporation CVE debrief

Who should care

Defenders of client-side Java deployments, particularly those running sandboxed Java Web Start applications or applets that load untrusted code, should assess exposure and prioritize patching.

Why it matters

Defenders should care about CVE-2026-91335 because it allows low-privileged attackers with network access to potentially read a subset of data in Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition deployments. This requires human interaction and applies to client-side Java deployments running sandboxed applications or applets with untrusted code. The impact is limited, with a CVSS score of 2.6, but patching is recommended to prevent potential data exposure.

• Potential unauthorized read access to a subset of accessible data
• Requires human interaction from a person other than the attacker
• Applies to Java deployments in clients, not servers

Technical summary

The vulnerability is in the AWT component of Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition. Supported versions that are affected include 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. The CVSS 3.1 Base Score is 2.6 (Confidentiality impacts).

Defensive priority

Assess exposure in client-side Java deployments, verify sandboxing, and prioritize patching for systems handling untrusted code.

Recommended defensive actions

• Assess exposure in client-side Java deployments
• Verify sandboxing configurations
• Prioritize patching for systems handling untrusted code
• Monitor for suspicious activity in Java-based applications
• Review compensating controls for exposed systems
• Track exceptions and retest remediated assets
• Confirm whether affected product deployments exist in managed environments

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, affected versions, and CVSS score. Oracle's security alert page is referenced for further information. The vulnerability affects Oracle Java SE, Oracle GraalVM for JDK, and Oracle GraalVM Enterprise Edition, with specific versions listed. Defenders should verify sandboxing configurations and assess exposure in client-side Java deployments. The CVSS 3.1 Base Score is 2.6, indicating low severity. However, patching is recommended to prevent potential data exposure. The N

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.