Quick answers
- Is CVE-2026-71166 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-71166 being exploited in the wild.
- How severe is CVE-2026-71166?
- Critical severity, with a CVSS score of 9.4, published 18 August 2026.
- Which products and versions are affected?
- Oracle Helidon 3.0.0 through 3.2.17.
- Is there a fix for CVE-2026-71166?
- 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-2026-71166 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-71166?
- 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
An easily exploitable vulnerability in the Helidon Imperative Web Server component (versions 3.0.0 through 3.2.17) allows unauthenticated network-based attackers to gain unauthorized access and control via HTTP. The vulnerability has a network attack vector with no authentication required and no user interaction needed. Successful exploitation results in unauthorized creation, deletion, or modification of critical data, complete confidentiality compromise of Helidon-accessible data, and partial denial of service. The CVSS 3.1 score of 9.4 reflects high impacts across confidentiality, integrity, and availability (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L).
Affected products
- Oracle Helidon 3.0.0 through 3.2.17
Timeline
- 2026-08-18: disclosed