CVE-2026-8711NGINX JavaScript 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.
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| F5 | NGINX JavaScript | 0.9.4 – < 0.9.9 | |
| f5 | njs | 0.9.4 – < 0.9.9 |
References and patches
- https://my.f5.com/manage/s/article/K000161307 vendor-advisoryVendor Advisory
CPE matches (NVD) (1)
cpe:2.3:a:f5:njs:*:*:*:*:*:*:*:*≥ 0.9.4 < 0.9.9