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CVE PROGRAM SOURCE RECORD9.2 Critical

CVE-2026-42055

NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability

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Status
Published
Published
Updated
Assigning organization
f5

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

F5 NGINX Open Source

Default version status: unknown

  • 1.13.10 to < 1.31.2affected
  • 1.30.2 to < 1.30.3affected

F5 NGINX Plus

Default version status: unaffected

  • 37.0 to < 37.0.2.1affected
  • R36 to < R36 P6affected

References