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CVE-2026-71152 – Unauthenticated RCE / Full System Compromise – Oracle Helidon 4.5.0 (Imperative Web

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Summary

CVE-2026-71152 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon. It allows an unauthenticated attacker with network access via HTTP to fully compromise the affected server, with complete loss of confidentiality, integrity, and availability. Oracle disclosed the flaw in its August 2026 Critical Patch Update, assigning it a maximum-severity CVSS v3.1 base score of 9.8.

Technical details

  • Component affected: Helidon’s Imperative Web Server (the synchronous/blocking web server implementation shipped with Helidon).
  • Root cause: Oracle’s advisory text describes the issue only as an "easily exploitable vulnerability" allowing an unauthenticated attacker to compromise Helidon over HTTP; no further technical root-cause detail (e.g., specific CWE, code path, or PoC) has been published by Oracle, NVD, or the CVE record as of this writing.
  • Trigger conditions: The vulnerability is reachable by any network-based attacker able to send HTTP requests to an exposed Helidon Imperative Web Server instance — no authentication or user interaction is required.
  • Attack vector: Network (HTTP), low attack complexity, no privileges required, no user interaction required.
  • Impact: Successful exploitation results in complete takeover of the Helidon server process, with high impact to confidentiality, integrity, and availability.

Affected software

  • Oracle Helidon 4.5.0 (Imperative Web Server component)

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: Apply the fix provided in Oracle’s August 2026 Critical Patch Update (CPU) advisory, which lists patched Helidon releases. Organizations running Helidon 4.5.0 should upgrade to the version designated as fixed in that CPU and verify via Oracle’s official patch availability documentation.
  • If immediate patching is not possible: Restrict network exposure of any Helidon Imperative Web Server instances — do not expose them directly to untrusted networks or the public internet; place them behind a properly configured reverse proxy, WAF, or network access control that limits inbound HTTP access to trusted sources only, until the patch can be applied.
  • Review internet-facing assets for instances of Oracle Helidon 4.5.0 and prioritize remediation given the unauthenticated, network-exploitable, full-compromise nature of this flaw.

References

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