CVE-2026-91409 Vulnerability in Oracle Java SE (component: Networking).
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-91409?
CVE-2026-91409 is a low-severity vulnerability in Oracle Java SE, published on 20 Oct 2026.
Official description
Vulnerability in Oracle Java SE (component: Networking). The supported version that is affected is Oracle Java SE: 27. 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 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 3.7 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).
Weakness: CWE-400
Which versions are affected by CVE-2026-91409?
How do I fix CVE-2026-91409?
No fix has been published for CVE-2026-91409 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-91409 being exploited?
There is no known exploitation of CVE-2026-91409 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91409, GHSA-5r5x-j567-5823, UBUNTU-CVE-2026-91409.