What is the CVSS score of EUVD-2026-62178?

EUVD-2026-62178 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.3%.

Which versions of Oracle Helidon are affected by EUVD-2026-62178?

Oracle Helidon 4.5.1's HTTP/2 implementation contains a denial-of-service vulnerability (CVE-2026-73935) that allows unauthenticated remote attackers to crash or indefinitely suspend web services…

How to fix or mitigate EUVD-2026-62178?

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). Within 7 days: Deploy interim mitigations including Web Application Firewall rules to filter malformed HTTP/2 traffic, enable connection rate limiting and timeout controls on load balancers, and restrict network access to Helidon instances via firewall policies. Within 30 days: Monitor Oracle's Critical Security Patch Update advisories for patch availability; upon release, schedule immediate maintenance to deploy the patch to all affected Helidon 4.5.1 instances or upgrade to a patched version if available.

Oracle Helidon EUVD-2026-62178

| CVE-2026-73935 HIGH

Improper Access Control (CWE-284)

2026-08-18 secalert_us@oracle.com

GHSA-27q8-w724-m357

Oracle Authentication Bypass Helidon

7.5

CVSS 3.1 · Vendor: oracle

Severity by source

Vendor (oracle) PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

vuln.today AI

7.5 HIGH

Network-reachable HTTP/2 service, no authentication required, exclusively availability impact with no confidentiality or integrity compromise possible.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Aug 18, 2026 - 21:54 vuln.today

CVE Published

Aug 18, 2026 - 21:18 nvd

HIGH 7.5

DescriptionCVE.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

Access

Identify exposed Helidon 4.5.1 HTTP/2 endpoint

Exploit

Send malformed or crafted HTTP/2 frames

Execution

Trigger hang or crash in Imperative Web Server

Impact

Service becomes completely unavailable

Access

Identify exposed Helidon 4.5.1 HTTP/2 endpoint

Exploit

Send malformed or crafted HTTP/2 frames

Execution

Trigger hang or crash in Imperative Web Server

Impact

Service becomes completely unavailable

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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