CVE-2026-91373 Vulnerability in Oracle Java SE (component: JSSE).
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-91373?
CVE-2026-91373 is a medium-severity vulnerability in Oracle Java SE, published on 20 Oct 2026.
Official description
Vulnerability in Oracle Java SE (component: JSSE). 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; 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 TLS to compromise Oracle Java SE. Successful attacks of this vulnerability can result in unauthorized ability to cause a partial denial of service (partial DOS) of Oracle Java SE. Note: This vulnerability can be exploited by using APIs in the specified Component, e.g., through a web service which supplies data to the APIs. This vulnerability also applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for security. CVSS 3.1 Base Score 5.3 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L).
Weakness: CWE-400
Which versions are affected by CVE-2026-91373?
How do I fix CVE-2026-91373?
Upgrade to a fixed version.
Is CVE-2026-91373 being exploited?
There is no known exploitation of CVE-2026-91373 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91373, GHSA-v4m5-q3qj-q97q, UBUNTU-CVE-2026-91373.