CVE-2026-9256

EIP tracks 1 public exploit for CVE-2026-9256. PoCs published by suominen.

AI-analyzed exploit summary This repository is a comprehensive technical analysis and tracking page for CVE-2026-9256, a heap buffer overflow vulnerability in nginx's ngx_http_rewrite_module. It includes detailed information on affected versions, distribution status, mitigation strategies, and verification steps.

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.