cve-2026-42055

{
  "cvss": 9.2,
  "datePublished": "2026-06-17T15:16:50.353",
  "dateUpdated": "2026-09-14T13:18:34.690",
  "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. \n\n\nNote: Software versions which have reached End of Technical Support (EoTS) are not evaluated.",
  "id": "CVE-2026-42055",
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    "sourceIdentifier": "f5sirt@f5.com",
    "vulnStatus": "Modified",
    "weaknesses": [
      {
        "description": [
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            "lang": "en",
            "value": "CWE-122"
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  "severity": "CRITICAL",
  "source": "nvd",
  "title": "NGINX Plus and NGINX Open Source have a vulnerability in the ngx_http_proxy_v2_module and ngx_http_grpc_module modules"
}