Tracker / CVE-2026-9256
CVE-2026-9256
NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_rewrite_module module. This vulnerability exists when a rewrite directive uses a regex pattern with distinct, overlapping Perl-Compatible Regular Expression (PCRE) captures (for example, ^/((.*))$) and a replacement string that references multiple such captures (for example, $1$2) in a redirect or arguments context. An unauthenticated attacker along with conditions beyond their control 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.
Affected products and versions
| debian | debian_linux |
|---|---|
| f5 | dos |
| f5 | dos · 4.3.0 → 4.7.0 |
| f5 | nginx_gateway_fabric · 1.3.0 → 1.6.2 |
| f5 | nginx_gateway_fabric · 2.0.0 → 2.6.2 |
| 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 → 5.4.3 |
| f5 | nginx_instance_manager · 2.17.0 → 2.22.1 |
| f5 | nginx_open_source |
| f5 | nginx_open_source · 0.1.17 → 0.9.7 |
| f5 | nginx_open_source · 1.0.0 → 1.30.2 |
| f5 | nginx_plus |
| f5 | nginx_plus · r33 → r36 |
| f5 | waf · 4.10.0 → 4.16.0 |
| f5 | waf · 5.2.0 → 5.8.0 |
| f5 | waf · 5.9.0 → 5.13.0 |
| redhat | discovery |
| redhat | enterprise_linux |
| redhat | hardened_images |
| redhat | update_infrastructure · 5.0 → 5.2 |