CVE-2026-8711— NGINX JavaScript vulnerability
Possible ATT&CK Techniques 2AI
T1068 · Exploitation for Privilege Escalation T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
堆缓冲区溢出
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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- https://my.f5.com/manage/s/article/K000161307vendor-advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-8711
IV. Related Vulnerabilities
Same vendor: F5
Same weakness: CWE-122
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HP Linux Imaging and Printing Software – Potential Escalatio - CVE-2026-9123
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V. Comments for CVE-2026-8711
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