CVE-2026-18329Network attack vectorHinoki check available

Unauthenticated access bypass via asynchronous exception

Published Sep 2, 2026 · Updated Sep 2, 2026

Access-control bypass in F5 NGINX JavaScript 0.9.9 through 1.0.0 allows remote attackers to reach protected resources. During asynchronous request-body continuation, js_access treats a thrown exception or unhandled rejection as success and resumes request processing. Exploitation requires a configured js_access handler that performs asynchronous body processing, and successful requests reach resources that the handler was meant to deny.

CVSS severity8.2
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Access-control bypass in F5 NGINX JavaScript 0.9.9 through 1.0.0 allows remote attackers to reach protected resources. During asynchronous request-body continuation, js_access treats a thrown exception or unhandled rejection as success and resumes request processing. Exploitation requires a configured js_access handler that performs asynchronous body processing, and successful requests reach resources that the handler was meant to deny.

The record

CVE
CVE-2026-18329
Published
Sep 2, 2026
Updated
Sep 2, 2026
Vendor
F5 Networks
Product
NGINX JavaScript
Classifications
CWE-636, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 2, 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=0.9.9 <*
  2. Affected versionversion=1.0.0 <1.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

F5 Networks · NGINX JavaScriptversion=0.9.9 <*; version=1.0.0 <1.0.1

Published CVSS scores

8.2F5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
8.8F5CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-636Not Failing Securely ('Failing Open')
T1190Exploit Public-Facing Application

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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