CVE-2026-42055

EIP tracks 2 public exploits for CVE-2026-42055. PoCs published by ChPratik, HORKimhab.

AI-analyzed exploit summary This repository contains a comprehensive cyber threat intelligence (CTI) report analyzing five NGINX vulnerabilities (including CVE-2026-42055), focusing on root cause analysis, configuration-dependent exposure, patch timelines, and attack prerequisites. The report provides deep technical details about heap overflows in HTTP/2 proxy/gRPC modules, regex map capture clobbering, and other vulnerabilities without including exploit code.

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.