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CVE-2026-73929 – Unauthenticated Data Tampering & Partial DoS – Oracle Helidon 4.5.3 (Imperative Web

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Summary

CVE-2026-73929 is a high-severity vulnerability (CVSS 8.3) affecting the Imperative Web Server component of Oracle Helidon version 4.5.3. The flaw allows an unauthenticated, remote attacker to send crafted HTTP requests that result in unauthorized modification, insertion, or deletion of accessible data, along with limited unauthorized data read access and partial denial-of-service conditions. Oracle disclosed the issue as part of its August 2026 Critical Security Patch Update.

Technical details

  • Root cause: A flaw in the Imperative Web Server component of Oracle Helidon that improperly handles or authorizes certain HTTP requests, permitting unintended data operations.
  • Trigger conditions: Exploitation requires only network access to an exposed Helidon-based HTTP service; no authentication or user interaction is needed, and Oracle rates the vulnerability as "easily exploitable."
  • Attack vector: Network (AV:N), low attack complexity (AC:L), no privileges required (PR:N), no user interaction (UI:N).
  • Impact: Scope is changed (S:C), meaning the vulnerability can affect resources beyond the vulnerable component itself. Confirmed impacts are unauthorized update/insert/delete access to accessible data, limited unauthorized read access to a subset of data, and partial denial of service.

Affected software

  • Oracle Helidon version 4.5.3 (Oracle Fusion Middleware family, Imperative Web Server component), as identified in the CVE-2026-73929 record and Oracle’s August 2026 Critical Security Patch Update.

Severity

  • CVSS v3.1 Base Score: 8.3 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:L

Mitigation and recommended actions

  • Immediate: Apply the Oracle Critical Security Patch Update released in August 2026, which addresses CVE-2026-73929 for Helidon. Organizations running Helidon 4.5.3 should upgrade to a version incorporating the fix as specified in Oracle’s advisory.
  • If immediate patching is not possible: Restrict network exposure of Helidon-based Imperative Web Server endpoints (e.g., via firewalling, VPN, or reverse-proxy access controls) to trusted networks only until the patch can be applied, and monitor HTTP access logs for anomalous requests attempting unauthorized data modification.

References

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