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CVE-2026-73916 – Unauthenticated Data Compromise (RCE-class Impact) – Oracle Helidon 3.2.18

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Summary

CVE-2026-73916 is a critical, easily exploitable vulnerability in Oracle Helidon affecting the Imperative Web Server component. It allows an unauthenticated attacker with network access via HTTP to compromise Helidon, resulting in unauthorized creation, deletion, or modification of critical data as well as complete access to all data accessible to Helidon. Oracle rates this vulnerability CRITICAL with a CVSS v3.1 base score of 9.1, and it was disclosed as part of Oracle’s August 2026 Critical Security Patch Update (CSPU).

Technical details

  • Root cause: A flaw in the Imperative Web Server component of Oracle Helidon that permits unauthorized data operations without any authentication check.
  • Trigger conditions: The vulnerability is remotely exploitable and does not require authentication (PR:N) or user interaction (UI:N); Oracle characterizes it as "easily exploitable."
  • Attack vector: Network (AV:N) via HTTP requests sent to the affected Helidon web server component.
  • Impact: Successful exploitation grants an unauthenticated attacker the ability to create, delete, or modify critical data on the system, and to read/access all data accessible through Helidon (high confidentiality and integrity impact). There is no impact to availability (A:N).

Affected software

  • Oracle Helidon version 3.2.18 (as confirmed in the official CVE record and NVD entry). This CVE was published alongside Oracle’s August 2026 CSPU, which also lists other Helidon release lines as receiving updates; organizations running any Helidon deployment should consult Oracle’s advisory directly to confirm whether their specific version and branch require patching.

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: Apply the fix provided in Oracle’s August 2026 Critical Security Patch Update (released August 18, 2026) for the Helidon Imperative Web Server component. Upgrade affected Helidon deployments to a version that includes the fix identified in the Oracle Security Alert advisory.
  • If immediate patching is not possible: Restrict network access to Helidon-based web services (e.g., via firewall rules, network segmentation, or placing the service behind an authenticating reverse proxy) to limit exposure to trusted networks until the patch can be applied. Monitor HTTP access logs for anomalous or unauthorized data-modification requests as an interim detection measure.

References

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