EUVD-2026-62178
GHSA-27q8-w724-m357
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable HTTP/2 service, no authentication required, exclusively availability impact with no confidentiality or integrity compromise possible.
Primary rating from Vendor (oracle).
CVSS VectorVendor: oracle
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
2DescriptionCVE.org
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).
AnalysisAI
Denial-of-service in Oracle Helidon 4.5.1's Imperative Web Server component allows unauthenticated remote attackers to crash or indefinitely hang the service via crafted HTTP/2 traffic. Disclosed as part of Oracle's Critical Security Patch Update (CPU) for August 2026, the vulnerability is rated CVSS 7.5 with low attack complexity and no privileges required, making automated exploitation straightforward against any exposed instance. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | No special conditions are required beyond network access to the Helidon service's HTTP/2 port - exploitation is remote and unauthenticated against the default configuration of Helidon 4.5.1's Imperative Web Server. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) accurately reflects the real-world risk profile: the vulnerability is trivially reachable over the network, requires zero authentication, and produces complete service disruption. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An unauthenticated attacker discovers a Helidon 4.5.1 service with its HTTP/2 port exposed, then sends specially crafted HTTP/2 frames or streams designed to trigger the defect in the Imperative Web Server's request handling logic. The service enters a hung or crash state, resulting in complete unavailability for legitimate clients. … |
| Remediation | Consult Oracle's Critical Security Patch Update for August 2026 at https://www.oracle.com/security-alerts/cspuaug2026.html to obtain the patched release. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Conduct inventory of all systems running Oracle Helidon 4.5.1 and document network exposure (public internet accessibility, internal networks, restricted access). …
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External POC / Exploit Code
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