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CVE-2026-73865 – Unauthenticated Data Compromise (RCE-class) – Oracle Helidon 3.2.18 (Imperative Web

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Summary

CVE-2026-73865 is a critical, easily exploitable vulnerability in the Imperative Web Server component of Oracle Helidon (part of Oracle Fusion Middleware). The flaw allows an unauthenticated, remote attacker with network access via HTTP to compromise Helidon, resulting in unauthorized creation, deletion, or modification of critical data as well as unauthorized read access to all Helidon-accessible data. Oracle disclosed the issue in its August 2026 Critical Patch Update, and it carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: A flaw in Helidon’s Imperative Web Server component that permits an attacker to bypass expected access controls when handling HTTP requests, as documented in Oracle’s Critical Patch Update advisory.
  • Trigger conditions: No authentication or user interaction is required; the vulnerable component only needs to be reachable over the network via HTTP.
  • Attack vector: Network (AV:N) — exploitable remotely by sending crafted HTTP requests to an exposed Helidon service.
  • Impact: High confidentiality impact (unauthorized read access to all Helidon-accessible data) and high integrity impact (unauthorized creation, deletion, or modification of critical data); no availability impact is noted (A:N).

Affected software

  • Oracle Helidon, version 3.2.18 (Imperative Web Server component), as identified in Oracle’s August 2026 Critical Patch Update.

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 Patch Update for the affected Helidon version (3.2.18). Oracle strongly recommends applying CPU security patches as soon as possible.
  • If immediate patching is not possible: Restrict network exposure of Helidon-based services — avoid exposing the Imperative Web Server component directly to untrusted networks or the public internet, and place it behind a properly configured firewall, WAF, or reverse proxy that limits access to trusted sources until the patch can be applied.
  • Review logs for unusual or unauthenticated HTTP requests to Helidon-hosted services as a precautionary detection measure.

References

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