CVE-2026-91453 Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Lightweight HTTP Server).
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-91453?
CVE-2026-91453 is a medium-severity vulnerability in Oracle GraalVM Enterprise Edition, published on 20 Oct 2026.
Official description
Vulnerability in the Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Lightweight HTTP Server). Supported versions that are affected are 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. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE, Oracle GraalVM for JDK, Oracle GraalVM Enterprise Edition accessible data. Note: This vulnerability can only be exploited by supplying data to APIs in the specified Component without using Untrusted Java Web Start applications or Untrusted Java applets, such as through a web service. CVSS 3.1 Base Score 5.3 (Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N).
Weakness: CWE-284
Which versions are affected by CVE-2026-91453?
How do I fix CVE-2026-91453?
Upgrade to a fixed version.
Is CVE-2026-91453 being exploited?
There is no known exploitation of CVE-2026-91453 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91453, GHSA-wh5x-8c26-q7r3, UBUNTU-CVE-2026-91453.