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CVE-2026-8711— NGINX JavaScript 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.

NGINX JavaScript是NGINX开源的一个扩展。 NGINX JavaScript存在安全漏洞，该漏洞源于js_fetch_proxy指令配置客户端控制的NGINX变量时，可能导致堆缓冲区溢出，进而导致工作进程重启；在ASLR禁用时可能执行代码。

CVSS 8.1 · High EPSS 0.79% · P55

Affected Version Matrix 1

VendorProduct Version RangeStatus
F5 NGINX JavaScript 0.9.4< 0.9.9 affected
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I. Basic Information for CVE-2026-8711

Vulnerability Information
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Vulnerability Title
NGINX JavaScript vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
NGINX JavaScript has a vulnerability when the js_fetch_proxy directive is configured with at least one client-controlled NGINX variable (for example, $http_*, $arg_*, $cookie_*) and a location invoking the ngx.fetch() operation from NGINX JavaScript. An unauthenticated attacker can exploit this vulnerability by sending crafted HTTP requests. This may cause a heap buffer overflow in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. 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:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
堆缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
NGINX JavaScript 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NGINX JavaScript是NGINX开源的一个扩展。 NGINX JavaScript存在安全漏洞，该漏洞源于js_fetch_proxy指令配置客户端控制的NGINX变量时，可能导致堆缓冲区溢出，进而导致工作进程重启；在ASLR禁用时可能执行代码。
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 0.9.4 ~ 0.9.9 -

II. Public POCs for CVE-2026-8711

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III. Intelligence Information for CVE-2026-8711

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Vendor Advisories for CVE-2026-8711 (1)

IV. Related Vulnerabilities

Same product: NGINX JavaScript
Same vendor: F5
Same weakness: CWE-122

V. Comments for CVE-2026-8711

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