Networking Vulnerability in Oracle Java SE and GraalVM Products
CVE-2026-91394

5.9MEDIUM

Key Information:

Vendor

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

What is CVE-2026-91394?

A vulnerability exists in Oracle Java SE and Oracle GraalVM for JDK that can be exploited by unauthenticated attackers with network access. This vulnerability involves multiple protocols, allowing unauthorized access to sensitive data. Attackers can exploit this issue through APIs in the networking component and also impact Java deployments, particularly in situations where untrusted code is being executed. Applications that load external resources are at risk, emphasizing the importance of robust security measures in Java environments.

Affected Version(s)

Oracle GraalVM for JDK 17.0.20.1

Oracle GraalVM for JDK 21.0.12.1

Oracle Java SE 11.0.32.1

References

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

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.