CVE-2026-8711: critical vulnerability in F5 NGINX JavaScript
NGINX JavaScript vulnerability
Published · Updated
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28Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 9.2epss 9.7%
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.
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
F5 · NGINX JavaScriptRelated CVEs — F5 NGINX JavaScript
In the same product, most dangerous first.
CVE-2026-78689CRITICALNGINX ngx_http_js_module vulnerablilityEPSS 0.8%CVE-2026-18329HIGHNGINX ngx_http_js_module vulnerabilityEPSS 0.6%CVE-2026-78222HIGHNGINX ngx_http_js_module vulnerabilityEPSS 0.6%CVE-2026-101025MEDIUMNGINX ngx_http_js_module vulnerabilityEPSS 0.3%CVE-2026-101019HIGHNGINX ngx_http_js_module vulnerabilityEPSS 0.2%