NGINX JavaScript vulnerability
CVE-2026-8711 is fixed in 4 products on 1 platform, first by libnginx-mod-http-js 0.9.4-1ubuntu0.1~esm1, released May 19, 2026. It is not reported as exploited. Patch Radar priority: High.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libnginx-mod-http-js · Ubuntu 26.04.1 LTS (resolute) | 0.9.4-1ubuntu0.1~esm1 | libnginx-mod-http-js 0.9.4-1ubuntu0.1~esm1 | May 19, 2026 |
| libnginx-mod-js · Debian 14 | 0.9.9-1 | DEBIAN-CVE-2026-8711 | May 27, 2026 |
| libnginx-mod-stream-js · Ubuntu 26.04.1 LTS (resolute) | 0.9.4-1ubuntu0.1~esm1 | libnginx-mod-stream-js 0.9.4-1ubuntu0.1~esm1 | May 19, 2026 |
| njs · Ubuntu 26.04.1 LTS (resolute) | 0.9.4-1ubuntu0.1~esm1 | njs 0.9.4-1ubuntu0.1~esm1 | May 19, 2026 |
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