CVE-2026-73907Network attack vector

Arbitrary file read via static symlink escape

Published Aug 18, 2026 · Updated Aug 19, 2026

Access control bypass in Oracle Helidon 3.2.18 allows remote attackers to read application data over HTTP via crafted static-content requests. The public Oracle advisory does not name the flaw, but Helidon 3.2.19 source changes for the static-content handler add real-path checks that reject files and welcome pages whose symlinks resolve outside the configured filesystem root. Exposure requires a route that serves filesystem-backed static content; where present, unauthenticated requests can read files that the Helidon process can access through that route, with confidentiality impact only.

CVSS severity7.5
High
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access control bypass in Oracle Helidon 3.2.18 allows remote attackers to read application data over HTTP via crafted static-content requests. The public Oracle advisory does not name the flaw, but Helidon 3.2.19 source changes for the static-content handler add real-path checks that reject files and welcome pages whose symlinks resolve outside the configured filesystem root. Exposure requires a route that serves filesystem-backed static content; where present, unauthenticated requests can read files that the Helidon process can access through that route, with confidentiality impact only.

The record

CVE
CVE-2026-73907
Published
Aug 18, 2026
Updated
Aug 19, 2026
Vendor
Oracle
Product
Helidon
Classifications
CWE-284, T1190
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=3.2.18

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Oracle · Helidonversion=3.2.18

Published CVSS scores

7.5OracleCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

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
T1190Exploit Public-Facing Application

Public exploit references

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Technologies

Your stack

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Your stack

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