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CVE-2026-71065 – Unauthenticated Remote Data Compromise – Oracle Helidon (Imperative Web Server) 3.2

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Summary

CVE-2026-71065 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon, affecting version 3.2.18. The flaw allows an unauthenticated attacker with network access via HTTP to compromise the server, resulting in unauthorized access to critical data and limited unauthorized modification of that data. Oracle has rated the issue CRITICAL with a CVSS v3.1 base score of 9.3, and it was published as part of Oracle’s August 2026 Critical Security Patch Update.

Technical details

  • Root cause: A weakness in the Imperative Web Server component of Oracle Helidon that permits an attacker to compromise the server without prior authentication.
  • Trigger conditions: No authentication or user interaction is required; the flaw is reachable over the network via standard HTTP requests to an exposed Helidon Imperative Web Server instance.
  • Attack vector: Network (AV:N), with low attack complexity (AC:L) and no privileges required (PR:N), making the vulnerability easily exploitable by remote, unauthenticated attackers.
  • Impact: The CVSS vector reflects a Scope Change (S:C), meaning a successful attack can affect resources beyond the vulnerable component itself. Impact includes high confidentiality loss (unauthorized access to critical or all Helidon-accessible data) and low integrity loss (unauthorized update, insert, or delete of some accessible data). There is no availability impact per the published vector.
  • CWE: Not yet assigned in the public CVE record at the time of writing.

Affected software

  • Oracle Helidon — Imperative Web Server component, version 3.2.18

Severity

  • CVSS v3.1 Base Score: 9.3 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Mitigation and recommended actions

  • Immediate: Apply the fixes provided in Oracle’s August 2026 Critical Security Patch Update advisory, which addresses this issue for Oracle Helidon. Oracle’s CVE record for this issue does not list a specific patched version number; affected organizations should follow the remediation guidance and patch availability information published directly in Oracle’s advisory for their specific Helidon deployment.
  • If immediate patching is not possible: Restrict network exposure of the Helidon Imperative Web Server to trusted networks only (e.g., via firewall rules, network segmentation, or placing the service behind an authenticated reverse proxy/VPN) to reduce the unauthenticated remote attack surface until the vendor patch can be applied.
  • Review Helidon deployments for any instance still running version 3.2.18 and prioritize remediation given the critical severity and unauthenticated network attack vector.

References

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