CVE catalog
CVE-2026-8711
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 invokin
- Severity
- Critical · CVSS 9.2
- Published
- Source
- [NVD] · [CVE record]
- EPSS
- 9.69% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | libnginx-mod-js | sid | 1.0.2-2 | fixed |
| Debian | libnginx-mod-js | forky | 1.0.2-2 | fixed |
| Debian | libnginx-mod-js | trixie | 0.8.9-1 | not affected |
| Debian | libnginx-mod-js | bookworm | 0.7.9-2 | not affected |
| Cpe | njs | Not reported | 0.9.9 | fixed |
| Alpine | nginx | 3.24 | 1.30.2-r1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | libnginx-mod-js | source | sid | 0.9.9-1 | not yet assigned | Not reported | [1137215] |
| Debian | libnginx-mod-js | source | forky | 0.9.9-1 | not yet assigned | Not reported | [1137215] |
| Debian | libnginx-mod-js | source | trixie | Not affected | unimportant | Not reported | [1137215] |
| Debian | libnginx-mod-js | source | bookworm | Not affected | unimportant | Not reported | [1137215] |
| Cpe | njs | cpe | Not reported | 0.9.9 | Not reported | Not reported | Not reported |
| Alpine | nginx | apk | 3.24 | 1.30.2-r1 | Not reported | ALPINE-CVE-2026-8711 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [libnginx-mod-http-js]Not affected
Source package: [libnginx-mod-js]
Details (2)
0.7.9-2· amd64 · bookwormNot affected
nvd · libnginx-mod-js · debian · bookworm
0.7.9-2· arm64 · bookwormNot affected
nvd · libnginx-mod-js · debian · bookworm
- [libnginx-mod-stream-js]Not affected
Source package: [libnginx-mod-js]
Details (2)
0.7.9-2· amd64 · bookwormNot affected
nvd · libnginx-mod-js · debian · bookworm
0.7.9-2· arm64 · bookwormNot affected
nvd · libnginx-mod-js · debian · bookworm
- [njs]Not affected
Source package: [libnginx-mod-js]
Details (2)
0.7.9-2· amd64 · bookwormNot affected
nvd · libnginx-mod-js · debian · bookworm
0.7.9-2· arm64 · bookwormNot affected
nvd · libnginx-mod-js · debian · bookworm
Observed:
References
- [https://nvd.nist.gov/vuln/detail/CVE-2026-8711]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-8711]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-8711]
- [https://security-tracker.debian.org/tracker/CVE-2026-8711]
[Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database]