High · published June 17, 2026
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules. This vulnerability exists when the proxy_http_version to 2 or grpc_pass directives are used to proxy HTTP/2 traffic, the ignore_invalid_headers directive is set to off, and the large_client_header_buffers directive size is larger than 2 megabytes. A remote, unauthenticated attacker, along with conditions beyond their control, could send large headers while creating an upstream request. This may cause a heap-based 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.
| Product | Versions | Fixed in |
|---|---|---|
| f5/dos | ≥ 4.3.0, ≤ 4.7.0 | — |
| f5/dos | all versions | — |
| f5/nginx_gateway_fabric | ≥ 1.3.0, ≤ 1.6.2 | — |
| f5/nginx_gateway_fabric | ≥ 2.0.0, ≤ 2.6.3 | — |
| f5/nginx_ingress_controller | ≥ 3.5.0, ≤ 3.7.2 | — |
| f5/nginx_ingress_controller | ≥ 4.0.0, ≤ 4.0.1 | — |
| f5/nginx_ingress_controller | ≥ 5.0.0, ≤ 5.5.0 | — |
| f5/nginx_instance_manager | ≥ 2.17.0, ≤ 2.22.0 | — |
| f5/nginx_open_source | ≥ 1.0.0, ≤ 1.30.2 | — |
| f5/nginx_open_source | ≥ 1.31.0, ≤ 1.31.1 | — |
| f5/nginx_plus | ≥ 37.0.0.1, < 37.0.2.1 | 37.0.2.1 |
| 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/waf | ≥ 4.10.0, ≤ 4.16.0 | — |
| f5/waf | ≥ 5.2.0, ≤ 5.8.0 | — |
| f5/waf | ≥ 5.9.0, ≤ 5.13.1 | — |
| redhat/discovery | all versions | — |
| redhat/hardened_images | all versions | — |
| redhat/update_infrastructure | ≥ 5.0, < 5.2 | 5.2 |
| redhat/enterprise_linux | all versions | — |
| redhat/enterprise_linux | all versions | — |
| redhat/enterprise_linux | all versions | — |