Quick answers
- Is CVE-2026-101588 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-101588 being exploited in the wild.
- How severe is CVE-2026-101588?
- Medium severity, with a CVSS score of 5.3, published 20 October 2026.
- Which products and versions are affected?
- Oracle Helidon 4.0.0–4.5.5, 27.0.0.
- Is there a fix for CVE-2026-101588?
- 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-2026-101588 attacked?
- It is attacked over the network, in a software library.
- Am I affected by CVE-2026-101588?
- 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 WebSocket component in Helidon versions 4.0.0–4.5.5 and 27.0.0 allows unauthenticated network attackers to access a subset of accessible data via HTTP. This is an information disclosure vulnerability that requires no user interaction or prior authentication, exploitable by any remote attacker with network access to an exposed WebSocket endpoint.
Affected products
- Oracle Helidon 4.0.0–4.5.5, 27.0.0
Timeline
- 2026-10-20: disclosed