CVE-2026-91487 Vulnerability in Oracle Java SE (component: Compiler).
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-91487?
CVE-2026-91487 is a medium-severity vulnerability in Oracle Java SE, published on 20 Oct 2026.
Official description
Vulnerability in Oracle Java SE (component: Compiler). Supported versions that are affected are Oracle Java SE: 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. Difficult to exploit vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized update, insert or delete access to some of Oracle Java SE accessible data as well as unauthorized read access to a subset of Oracle Java SE 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 4.8 (Confidentiality and Integrity impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N).
Weakness: CWE-284
Which versions are affected by CVE-2026-91487?
How do I fix CVE-2026-91487?
Upgrade to a fixed version.
Is CVE-2026-91487 being exploited?
There is no known exploitation of CVE-2026-91487 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91487, GHSA-5f2x-x4h6-xw49, UBUNTU-CVE-2026-91487.