# CVE-2026-83459: Oracle Helidon media multipart denial of service

Source: https://junglewise.ai/threats/cve-2026-83459-oracle-helidon-media-multipart-denial-of-service  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-15. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-83459 · Severity: medium · CVSS 5.3 · Published 2026-09-15

Oracle Helidon is a lightweight Java framework used to build microservices and cloud-native applications. A vulnerability in its multipart media handling component allows unauthenticated attackers to trigger a partial denial of service via network requests, potentially disrupting service availability for legitimate users without requiring authentication or user interaction.

Technologies: [Oracle Helidon](https://junglewise.ai/threats/technologies/helidon). Vendors: [Oracle](https://junglewise.ai/threats/vendors/oracle).

## 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

## References

- [https://www.oracle.com/security-alerts/cspusep2026.html](https://www.oracle.com/security-alerts/cspusep2026.html)

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