CVE-2026-73935
Received Received - Intake

Denial of Service in Helidon

Publication date: 2026-08-18

Last updated on: 2026-08-18

Assigner: Oracle

Description
Vulnerability in the Helidon product of Oracle Fusion Middleware (component: Imperative Web Server). The supported version that is affected is 4.5.1. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP/2 to compromise Helidon. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of Helidon. CVSS 3.1 Base Score 7.5 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

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Meta Information

Published
2026-08-18
Last Modified
2026-08-18
Generated
2026-08-19
AI Q&A
2026-08-19
EPSS Evaluated
N/A
NVD
CVE-2026-73935

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
oracle helidon 4.5.1

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a denial-of-service (DoS) vulnerability in Oracle Fusion Middleware's Helidon product, specifically in the Imperative Web Server component. It affects version 4.5.1 and allows unauthenticated attackers to remotely crash the server by sending specially crafted HTTP/2 requests, causing repeated crashes or hangs.

Detection Guidance

Detecting this vulnerability requires checking for vulnerable versions of Oracle Helidon 4.5.1. Inspect installed Helidon packages using commands like 'java -jar helidon.jar --version' or checking package managers (e.g., 'dpkg -l | grep helidon' for Debian-based systems). Monitor network traffic for HTTP/2 requests targeting Helidon services.

Impact Analysis

If exploited, this vulnerability could disrupt services by making the Helidon server unavailable, leading to downtime for applications relying on it. Since it requires no authentication and network access, any exposed instance could be targeted.

Mitigation Strategies

Upgrade Oracle Helidon to a version unaffected by this vulnerability. If upgrading is not immediately possible, restrict network access to Helidon services via firewalls or disable HTTP/2 support. Apply Oracle's official patches or workarounds as soon as they are available.

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