Security Flaw in Oracle Java SE and GraalVM Products
CVE-2026-21945

7.5HIGH

Key Information:

Vendor

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

What is CVE-2026-21945?

A security vulnerability has been identified in Oracle Java SE and GraalVM products that exposes users to potential denial of service (DoS) attacks. This issue affects clients running untrusted code in sandboxed Java environments, allowing an unauthenticated attacker with network access to disrupt services. If exploited, attackers can cause the application to hang or crash repeatedly, severely impacting availability. It is important to note that the vulnerability does not affect Java deployments that run only trusted code.

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Affected Version(s)

Oracle GraalVM Enterprise Edition 21.3.16

Oracle GraalVM for JDK 17.0.17

Oracle GraalVM for JDK 21.0.9

References

https://www.oracle.com/security-alerts/cpujan2026.html
vendor-advisory

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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