Quick answers
- Is CVE-2026-91395 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91395 being exploited in the wild.
- How severe is CVE-2026-91395?
- Medium severity, with a CVSS score of 6.5, published 20 October 2026.
- Which products and versions are affected?
- Oracle GraalVM Enterprise Edition 21.3.19.1.1; Oracle Graalvm For Jdk 17.0.20.1, 21.0.12.1; Oracle Java SE 8u503, 8u503-perf, 11.0.32.1.
- Is there a fix for CVE-2026-91395?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2026-91395 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-91395?
- Check whether you run Oracle GraalVM Enterprise Edition, Oracle Graalvm For Jdk or Oracle Java SE at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is in the Utility component of Oracle Java SE and related products and is easily exploitable via network protocols without requiring authentication, credentials, or user interaction. Successful exploitation allows an attacker to gain unauthorized data modification/deletion access and trigger partial denial of service. The flaw can be leveraged through APIs in the Utility component, including in web services that process untrusted data, and affects Java applets and Web Start deployments in sandboxed environments.
Affected products
- Oracle Java SE 8u503, 8u503-perf, 11.0.32.1
- Oracle GraalVM for JDK 17.0.20.1, 21.0.12.1
- Oracle GraalVM Enterprise Edition 21.3.19.1.1
Timeline
- 2026-10-20: advisory