NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_slice_module module. When the slice directive and unnamed regex captures are configured or when a background cache update happens, unauthenticated attackers can send requests that may cause uninitialized memory access in the NGINX worker process, leading to limited disclosure of memory or a restart.
Impact: This vulnerability may allow remote, unauthenticated attackers to have limited control to disclose memory contents or restart the NGINX worker process. There is no control plane exposure; this is a data plane issue only. Note: The ngx_http_slice_module module is not enabled by default; its enabled with the –with-http_slice_module configuration parameter.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness
The product uses or accesses a resource that has not been initialized.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Nginx_app_protect_waf | F5 | 4.11.0 (including) | 4.16.0 (including) |
| Nginx_app_protect_waf | F5 | 5.2.0 (including) | 5.8.0 (including) |
| Nginx_gateway_fabric | F5 | 1.3.0 (including) | 1.6.2 (including) |
| Nginx_gateway_fabric | F5 | 2.0.0 (including) | 2.6.7 (excluding) |
| Nginx_ingress_controller | F5 | 3.5.0 (including) | 3.7.2 (including) |
| Nginx_ingress_controller | F5 | 5.0.0 (including) | 5.5.3 (excluding) |
| Nginx_ingress_controller | F5 | 2026-lts-r1 (including) | 2026-lts-r4 (excluding) |
| Nginx_ingress_controller | F5 | 4.0.0 (including) | 4.0.0 (including) |
| Nginx_ingress_controller | F5 | 4.0.1 (including) | 4.0.1 (including) |
| Nginx_instance_manager | F5 | 2.17.0 (including) | 2.22.2 (excluding) |
| Nginx_open_source | F5 | 1.30.0 (including) | 1.30.4 (excluding) |
| Nginx_open_source | F5 | 1.31.2 (including) | 1.31.2 (including) |
| Nginx_plus | F5 | 37.0.0.1 (including) | 37.0.3.1 (excluding) |
| Nginx_plus | F5 | r33 (including) | r36 (excluding) |
| Nginx_plus | F5 | 37.0.0 (including) | 37.0.0 (including) |
| Nginx_plus | F5 | r36 (including) | r36 (including) |
| Nginx_plus | F5 | r36-p1 (including) | r36-p1 (including) |
| Nginx_plus | F5 | r36-p2 (including) | r36-p2 (including) |
| Nginx_plus | F5 | r36-p3 (including) | r36-p3 (including) |
| Nginx_plus | F5 | r36-p4 (including) | r36-p4 (including) |
| Nginx_plus | F5 | r36-p5 (including) | r36-p5 (including) |
| Nginx_plus | F5 | r36-p6 (including) | r36-p6 (including) |
| Waf | F5 | 5.9.0 (including) | 5.13.4 (excluding) |
| Red Hat Hardened Images | RedHat | nginx-main-1.30.4-2.hum1 | * |
| Nginx | Ubuntu | devel | * |
| Nginx | Ubuntu | jammy | * |
| Nginx | Ubuntu | noble | * |
| Nginx | Ubuntu | resolute | * |
| Nginx | Ubuntu | upstream | * |