High · published July 15, 2026
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; it's enabled with the --with-http_slice_module configuration parameter.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
| Product | Versions | Fixed in |
|---|---|---|
| f5/nginx_gateway_fabric | ≥ 1.3.0, ≤ 1.6.2 | — |
| f5/nginx_gateway_fabric | ≥ 2.0.0, < 2.6.7 | 2.6.7 |
| f5/nginx_ingress_controller | ≥ 3.5.0, ≤ 3.7.2 | — |
| f5/nginx_ingress_controller | ≥ 5.0.0, < 5.5.3 | 5.5.3 |
| f5/nginx_ingress_controller | ≥ 2026-lts-r1, < 2026-lts-r4 | 2026-lts-r4 |
| f5/nginx_ingress_controller | all versions | — |
| f5/nginx_ingress_controller | all versions | — |
| f5/nginx_instance_manager | ≥ 2.17.0, < 2.22.2 | 2.22.2 |
| f5/nginx_open_source | ≥ 1.30.0, < 1.30.4 | 1.30.4 |
| f5/nginx_open_source | all versions | — |
| f5/nginx_plus | ≥ 37.0.0.1, < 37.0.3.1 | 37.0.3.1 |
| f5/nginx_plus | ≥ r33, < r36 | r36 |
| f5/nginx_plus | all versions | — |
| f5/nginx_plus | all versions | — |
| f5/nginx_plus | all versions | — |
| f5/nginx_plus | all versions | — |
| f5/nginx_plus | all versions | — |
| f5/nginx_plus | all versions | — |
| f5/nginx_plus | all versions | — |
| f5/waf | ≥ 4.11.0, ≤ 4.16.0 | — |
| f5/waf | ≥ 5.2.0, ≤ 5.8.0 | — |
| f5/waf | ≥ 5.9.0, < 5.13.4 | 5.13.4 |