Network Vulnerability in Oracle Java SE and GraalVM Products
CVE-2026-91398

6.8MEDIUM

Key Information:

Vendor

Oracle
Status
Oracle Java Se
Oracle Graalvm For Jdk
Oracle Graalvm Enterprise Edition
Vendor
CVE Published:
20 October 2026

What is CVE-2026-91398?

A vulnerability in Oracle Java SE and GraalVM products allows an unauthenticated attacker with network access via SOCKS5 to compromise the system. This vulnerability, existing in several supported versions, can enable unauthorized creation, deletion, or modification of critical data. It poses a risk not only to the affected products but potentially impacts additional systems relying on Oracle Java SE and GraalVM for functionality. Exploitation occurs through APIs, highlighting the need for enhanced security measures in Java environments, especially those deploying untrusted code via Java Web Start applications or applets.

Affected Version(s)

Oracle GraalVM Enterprise Edition 21.3.19.1.1

Oracle GraalVM for JDK 17.0.20.1

Oracle GraalVM for JDK 21.0.12.1

References

https://www.oracle.com/security-alerts/cpuoct2026.html
vendor-advisory

CVSS V3.1

Score:
6.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.