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CVE-2026-78222— 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 0.5.1至1.0.1之前版本存在异常处理不当漏洞，该漏洞源于ngx.fetch()收到格式错误的HTTP响应时可导致空指针解引用，可能使NGINX工作进程崩溃，远程攻击者可利用该漏洞造成拒绝服务。

CVSS 7.5 · High EPSS 0.62% · P49

Affected Version Matrix 1

VendorProduct Version RangeStatus
F5 NGINX JavaScript 0.5.1< 1.0.1 affected
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I. Basic Information for CVE-2026-78222

Vulnerability Information
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Vulnerability Title
NGINX ngx_http_js_module vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability exists in NGINX JavaScript where a malformed HTTP response received by ngx.fetch() can crash an NGINX worker when trusted JavaScript reads Response.statusText. Exploitation requires control or influence over the fetched HTTP response. Impact: This vulnerability may allow remote attackers to cause a denial-of-service (DoS) on the NGINX system. 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:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
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 0.5.1至1.0.1之前版本存在异常处理不当漏洞，该漏洞源于ngx.fetch()收到格式错误的HTTP响应时可导致空指针解引用，可能使NGINX工作进程崩溃，远程攻击者可利用该漏洞造成拒绝服务。
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 0.5.1 ~ 1.0.1 -

II. Public POCs for CVE-2026-78222

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III. Intelligence Information for CVE-2026-78222

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Vendor Advisories for CVE-2026-78222 (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-2026-18329 8.2 HIGH NGINX ngx_http_js_module vulnerability
CVE-2026-78689 8.1 HIGH NGINX ngx_http_js_module vulnerablility
CVE-2026-66362 8.1 HIGH NGF 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-476

V. Comments for CVE-2026-78222

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