Quick answers
- Is CVE-2026-83458 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83458 being exploited in the wild.
- How severe is CVE-2026-83458?
- Medium severity, with a CVSS score of 5.3, published 15 September 2026.
- Which products and versions are affected?
- Oracle Helidon 4.0.0-4.5.4.
- Is there a fix for CVE-2026-83458?
- 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-2026-83458 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-83458?
- 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
This is a denial-of-service vulnerability in the JSON parsing component of Oracle Helidon framework versions 4.0.0 through 4.5.4. The vulnerability is easily exploitable, requiring no authentication and accessible via the network through HTTP. An unauthenticated attacker can craft malicious JSON payloads that trigger excessive resource consumption, resulting in partial denial of service of the affected Helidon instance. The attack vector is network-based with low complexity and no user interaction required. Patches are expected in Oracle's regular security update cycle.
Affected products
- Oracle Helidon 4.0.0-4.5.4
Timeline
- 2026-09-15: disclosed