CVE-2026-8711
CVE-2026-8711 · NGINX JavaScript vulnerability
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 9.2 · Critical · EPSS 0.8% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
nginx javascript
- Versions
- ≥ 0.9.4, < 0.9.9: Affected (custom)
Update to 0.9.9
libnginx-mod-js Debian:14
- Versions
- 0.8.9-1
- 0.9.1-1
- 0.9.4-1
- 0.9.6-1
- 0.9.8-1
- Affected ranges
- ECOSYSTEM: < 0.9.9-1
Update to 0.9.9-1
libnginx-mod-js Ubuntu:26.10
- Versions
- 0.9.4-1build2
- 0.9.9-2
- 1.0.0-1
- 1.0.0-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libnginx-mod-js Ubuntu:Pro:26.04:LTS
- Versions
- 0.9.1-1ubuntu2
- 0.9.1-1ubuntu3
- 0.9.4-1~build1
- 0.9.4-1
- 0.9.4-1build1
- 0.9.4-1build2
- Affected ranges
- ECOSYSTEM: < 0.9.4-1ubuntu0.1~esm1
Update to 0.9.4-1ubuntu0.1~esm1