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CVE-2026-18329— NGINX ngx_http_js_module vulnerability

Quick assessment

Affected
F5 NGINX JavaScript
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

F5 NGINX JavaScript是美国F5公司的一个嵌入式JavaScript脚本语言。 F5 NGINX JavaScript 0.9.9版本和1.0.0版本存在异常处理不当漏洞，该漏洞源于js_access处理器在异步请求体处理过程中抛出异常，导致访问控制失效开放，可能使未经身份验证的攻击者通过发送特制HTTP请求绕过身份验证或授权，未授权访问受保护资源。

CVSS 8.2 · High EPSS 0.38% · P30

Affected Version Matrix 2

VendorProduct Version RangeStatus
F5 NGINX JavaScript 1.0.0< 1.0.1 affected
0.9.9< * affected
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I. Basic Information for CVE-2026-18329

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_js_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未能安全地进行程序失效(Failing Open)
Source: CVE Program / CVE List V5
Vulnerability Title
F5 NGINX JavaScript 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
F5 NGINX JavaScript是美国F5公司的一个嵌入式JavaScript脚本语言。 F5 NGINX JavaScript 0.9.9版本和1.0.0版本存在异常处理不当漏洞，该漏洞源于js_access处理器在异步请求体处理过程中抛出异常，导致访问控制失效开放，可能使未经身份验证的攻击者通过发送特制HTTP请求绕过身份验证或授权，未授权访问受保护资源。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
F5 NGINX JavaScript 1.0.0 ~ 1.0.1 -

II. Public POCs for CVE-2026-18329

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III. Intelligence Information for CVE-2026-18329

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Vendor Pages for CVE-2026-18329 (1)

Same Patch Batch · F5 · 2026-09-02 · 7 CVEs total

CVE-2026-66842 8.8 HIGH BIG-IP and BIG-IQ Configuration utility vulnerability
CVE-2026-77180 8.3 HIGH NGINX Ingress Controller vulnerability
CVE-2026-78689 8.1 HIGH NGINX ngx_http_js_module vulnerablility
CVE-2026-66362 8.1 HIGH NGF vulnerability
CVE-2026-78222 7.5 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-63020 3.1 LOW BIG-IP Configuration utility vulnerability

IV. Related Vulnerabilities

Same product: NGINX JavaScript
Same vendor: F5
Same weakness: CWE-636

V. Comments for CVE-2026-18329

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