Quick answers
- Is CVE-2026-91417 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-91417 being exploited in the wild.
- How severe is CVE-2026-91417?
- Medium severity, with a CVSS score of 5.3, published 20 October 2026.
- Which products and versions are affected?
- Oracle GraalVM Enterprise Edition 21.3.19.1.1; Oracle Java SE 8u503, 8u503-perf.
- Is there a fix for CVE-2026-91417?
- 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-2026-91417 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-91417?
- Check whether you run Oracle GraalVM Enterprise Edition 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 a denial-of-service flaw in the CORBA component that can be exploited by sending malicious input to affected APIs over the network without authentication. The attack does not require Java Web Start or applets, but direct API invocation. Successful exploitation causes partial unavailability of the affected Java process.
Affected products
- Oracle Java SE 8u503, 8u503-perf
- Oracle GraalVM Enterprise Edition 21.3.19.1.1
Timeline
- 2026-10-20: disclosed