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CVE-2026-42055

NGINX ngx_http_proxy_v2_module and ngx_http_grpc_module vulnerability

CVSS 3.1 8.1 HIGHCVSS 4.0 9.2 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-42055

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-42055

Published

NGINX Open Source

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unknown",
                    "modules": [
                        "ngx_http_proxy_v2_module",
                        "ngx_http_grpc_module"
                    ],
                    "product": "NGINX Open Source",
                    "vendor": "F5",
                    "versions": [
                        {
                            "lessThan": "1.31.2",
                            "status": "affected",
                            "version": "1.13.10",
                            "versionType": "custom"
                        },
                        {
                            "lessThan": "1.30.3",
                            "status": "affected",
                            "version": "1.30.2",
                            "versionType": "custom"
                        }
                    ]
                }

NGINX Plus

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "defaultStatus": "unaffected",
                    "modules": [
                        "ngx_http_proxy_v2_module",
                        "ngx_http_grpc_module"
                    ],
                    "product": "NGINX Plus",
                    "vendor": "F5",
                    "versions": [
                        {
                            "lessThan": "37.0.2.1",
                            "status": "affected",
                            "version": "37.0",
                            "versionType": "custom"
                        },
                        {
                            "lessThan": "R36 P6",
                            "status": "affected",
                            "version": "R36",
                            "versionType": "custom"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON