Quick answers
- Is CVE-2026-83480 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-83480 being exploited in the wild.
- How severe is CVE-2026-83480?
- 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-2026-83480?
- 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-2026-83480 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-83480?
- 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 WebSocket component of Oracle Helidon versions 4.0.0 through 4.5.4. It is an easily exploitable flaw that allows an unauthenticated attacker with network access to send crafted HTTP requests that trigger a partial denial of service condition. The attack requires no authentication, user interaction, or special configuration, and can be launched remotely over the network. Successful exploitation results in partial unavailability of the affected Helidon instance. Oracle has issued a security update addressing this issue.
Affected products
- Oracle Helidon 4.0.0-4.5.4
Timeline
- 2026-09-15: disclosed
- 2026-09-15: advisory