CVE-2026-42055 - NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability

CVE-2026-42055 - NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability

https://cvefeed.io/rssfeed/latest.atom / Wed, 06/17/2026 - 17:45
CVE ID :CVE-2026-42055
Published : June 17, 2026, 2:04 p.m. | 1 hour, 34 minutes ago
Description :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.
Severity: 9.2 | CRITICAL
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