Title: NGINX JavaScript de F5, Description: NGINX JavaScript tiene una vulnerabilidad cuando la directiva js_fetch_proxy está configurada con al menos una variable NGINX controlada por el cliente (por ejemplo, $http_*, $arg_*, $cookie_*) y una ubicación que invoca la operación ngx.fetch() desde NGINX JavaScript. Un atacante no autenticado puede explotar esta vulnerabilidad enviando solicitudes HTTP manipuladas. Esto puede causar un desbordamiento de búfer de pila en el proceso de trabajador de NGINX, lo que lleva a un reinicio. Además, los atacantes pueden ejecutar código en sistemas con la aleatorización del espacio de direcciones (ASLR) deshabilitada o cuando el atacante puede eludir ASLR.

Nota: Las versiones de software que han alcanzado el Fin de Soporte Técnico (EoTS) no son evaluadas.

{"timestamp":"2026-05-19T00:00:00+00:00","id":"CVE-2026-8711","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"F5","product":"NGINX JavaScript","defaultStatus":"unknown","modules":["ngx_http_js_module"],"versions":[{"version":"0.9.4","lessThan":"0.9.9","versionType":"custom","status":"affected"}]}]

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

OR
          *cpe:2.3:a:f5:njs:*:*:*:*:*:*:*:* versions from (including) 0.9.4 up to (excluding) 0.9.9

F5 Networks: https://my.f5.com/manage/s/article/K000161307 Types: Vendor Advisory

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, for systems with Address Space Layout Randomization (ASLR) disabled, code execution is possible. 


Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

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.

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, for systems with Address Space Layout Randomization (ASLR) disabled, code execution is possible. 


Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-122

https://my.f5.com/manage/s/article/K000161307