CVE-2026-73932Network attack vector

Unauthenticated partial denial of service

Published Aug 18, 2026 · Updated Aug 19, 2026

Denial of service in Oracle Helidon 4.5.3 allows remote attackers to degrade service availability via crafted HTTP requests. Oracle has not published the exact failing code path in the Imperative Web Server, but Helidon 4.5.3 added a hard limit on JSON parser nesting depth, suggesting the flaw is resource exhaustion from excessively nested input rather than a complete server crash. The issue is reachable without authentication over HTTP and is described by Oracle as a partial, not complete, denial of service, with no published indication of data exposure or modification.

CVSS severity5.3
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Oracle Helidon 4.5.3 allows remote attackers to degrade service availability via crafted HTTP requests. Oracle has not published the exact failing code path in the Imperative Web Server, but Helidon 4.5.3 added a hard limit on JSON parser nesting depth, suggesting the flaw is resource exhaustion from excessively nested input rather than a complete server crash. The issue is reachable without authentication over HTTP and is described by Oracle as a partial, not complete, denial of service, with no published indication of data exposure or modification.

The record

CVE
CVE-2026-73932
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Oracle
Product
Helidon
Classifications
CWE-284, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Helidonversion=4.5.3

Published CVSS scores

5.3OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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