Quick answers
- Is CVE-2026-83459 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83459 being exploited in the wild.
- How severe is CVE-2026-83459?
- Medium severity, with a CVSS score of 5.3, published 15 September 2026.
- Which products and versions are affected?
- Oracle Helidon 3.0.0-3.2.20.
- Is there a fix for CVE-2026-83459?
- 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-2026-83459 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-83459?
- Check whether you run Oracle Helidon 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 exists in the helidon-media-multipart component of Oracle Helidon (versions 3.0.0 through 3.2.20) and is exploitable via HTTP requests from unauthenticated, network-accessible attackers. The flaw is easily exploitable with no authentication or special conditions required (AC:L). A successful attack results in partial denial of service affecting availability of the Helidon application. The vulnerability has a CVSS 3.1 score of 5.3, reflecting low-to-medium impact on availability with no confidentiality or integrity compromise.
Affected products
- Oracle Helidon 3.0.0-3.2.20
Timeline
- 2026-09-15: disclosed