Not Failing Securely ('Failing Open') Affecting libnginx-mod-js package, versions *


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.38% (29th percentile)

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  • Snyk IDSNYK-ECHOLATEST-LIBNGINXMODJS-19529267
  • published4 Sept 2026
  • disclosed2 Sept 2026

Introduced: 2 Sep 2026

CVE-2026-18329  (opens in a new tab)
CWE-636  (opens in a new tab)

How to fix?

There is no fixed version for Echo:latest libnginx-mod-js.

NVD Description

Note: Versions mentioned in the description apply only to the upstream libnginx-mod-js package and not the libnginx-mod-js package as distributed by Echo. See How to fix? for Echo:latest relevant fixed versions and status.

Description

NGINX JavaScript (njs) and QuickJS (qjs) engines have a vulnerability when a js_access handler performs asynchronous request body processing and an exception is thrown during asynchronous access-control evaluation before an explicit access denial is returned. An unauthenticated attacker can exploit this vulnerability by sending a crafted HTTP request that triggers an error condition in the access validation logic. This may cause the js_access phase to fail open, allowing the request to proceed instead of being denied, resulting in an authentication or authorization bypass and unauthorized access to protected resources.

Impact

This vulnerability may allow remote attackers to bypass js_access controls. There is no control plane exposure; this is a data plane issue only.

Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS Base Scores

version 3.1