CVE-2026-87291 Vulnerability in Oracle Java SE (component: Networking).
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-87291?
CVE-2026-87291 is a medium-severity vulnerability in Oracle Java SE, published on 20 Oct 2026.
Official description
Vulnerability in Oracle Java SE (component: Networking). Supported versions that are affected are Oracle Java SE: 21.0.12.1, 25.0.4.1 and 27. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise Oracle Java SE. Successful attacks of this vulnerability can result in 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 5.3 (Confidentiality impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N).
Weakness: CWE-287
Which versions are affected by CVE-2026-87291?
How do I fix CVE-2026-87291?
Upgrade to a fixed version.
Is CVE-2026-87291 being exploited?
There is no known exploitation of CVE-2026-87291 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-87291, GHSA-r3pr-m76q-f8wv, UBUNTU-CVE-2026-87291.