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CVE-2026-71167 – Unauthenticated RCE-class Data Compromise – Oracle Helidon 4.5.0 (Imperative Web Se

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Summary

CVE-2026-71167 is a critical, remotely exploitable vulnerability in the Imperative Web Server component of Oracle Helidon, an open-source framework for building Java microservices. The flaw allows an unauthenticated attacker with network access via HTTP to compromise Helidon, enabling unauthorized creation, deletion, or modification of critical data as well as unauthorized read access to all Helidon-accessible data, and can trigger a partial denial of service. Oracle rates this vulnerability CRITICAL with a CVSS 3.1 base score of 9.4.

Technical details

  • Root cause: A weakness in the Imperative Web Server component of Helidon that permits an attacker to bypass expected access controls over HTTP; Oracle’s advisory does not disclose deeper implementation-level root cause detail beyond the component name.
  • Trigger conditions: No authentication or user interaction is required; the vulnerability is described by Oracle as "easily exploitable."
  • Attack vector: Network-based (AV:N), delivered over HTTP, with low attack complexity (AC:L) and no privileges required (PR:N).
  • Impact: High confidentiality impact (full read access to Helidon-accessible data), high integrity impact (unauthorized creation/deletion/modification of critical data), and low availability impact (partial denial of service).

Affected software

  • Oracle Helidon, version 4.5.0 (Imperative Web Server component) — the version explicitly listed as affected in the official CVE record for CVE-2026-71167.
  • Oracle’s August 2026 Critical Security Patch Update advisory lists the broader Helidon product line covered by this update cycle as versions 1.4.19, 1.4.20, 3.2.18, 3.2.19, 3.2.20, 4.5.0, 4.5.1, and 4.5.3; organizations running any of these releases should consult Oracle’s Helidon Patch Availability Document to confirm which specific CVEs (including CVE-2026-71167 and related Helidon CVEs published in the same update) apply to their exact version.

Severity

  • CVSS v3.1 Base Score: 9.4 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

Mitigation and recommended actions

  • Immediate: Apply the Oracle-published security patch for Helidon as documented in Oracle’s August 2026 Critical Security Patch Update Patch Availability Document (My Oracle Support Doc ID KB924578). Upgrade affected Helidon 4.5.0 deployments to a patched release identified in that document.
  • If patching cannot be performed immediately: Restrict network exposure of the Helidon Imperative Web Server to trusted networks only (e.g., via firewall rules or network segmentation), and monitor HTTP traffic to affected services for anomalous requests until the patch can be applied. Oracle strongly recommends customers remain on actively-supported, patched versions, noting that successful attacks in the wild have historically occurred against organizations that failed to apply available patches promptly.

References

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