{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-30852",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-03-05T21:27:35.341Z",
        "datePublished": "2026-03-07T16:28:26.894Z",
        "dateUpdated": "2026-03-09T18:24:55.495Z"
    },
    "containers": {
        "cna": {
            "title": "Caddy: vars_regexp double-expands user input, leaking env vars and files",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-200",
                            "lang": "en",
                            "description": "CWE-200: Exposure of Sensitive Information to an Unauthorized Actor",
                            "type": "CWE"
                        }
                    ]
                },
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-74",
                            "lang": "en",
                            "description": "CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV4_0": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "LOW",
                        "attackRequirements": "NONE",
                        "privilegesRequired": "NONE",
                        "userInteraction": "NONE",
                        "vulnConfidentialityImpact": "LOW",
                        "vulnIntegrityImpact": "NONE",
                        "vulnAvailabilityImpact": "NONE",
                        "subConfidentialityImpact": "NONE",
                        "subIntegrityImpact": "NONE",
                        "subAvailabilityImpact": "NONE",
                        "baseScore": 5.5,
                        "baseSeverity": "MEDIUM",
                        "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:P",
                        "version": "4.0"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/caddyserver/caddy/security/advisories/GHSA-m2w3-8f23-hxxf",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/caddyserver/caddy/security/advisories/GHSA-m2w3-8f23-hxxf"
                },
                {
                    "name": "https://github.com/caddyserver/caddy/pull/5408",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/caddyserver/caddy/pull/5408"
                },
                {
                    "name": "https://github.com/caddyserver/caddy/releases/tag/v2.11.2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/caddyserver/caddy/releases/tag/v2.11.2"
                }
            ],
            "affected": [
                {
                    "vendor": "caddyserver",
                    "product": "caddy",
                    "versions": [
                        {
                            "version": ">= 2.7.5, < 2.11.2",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-03-07T16:28:26.894Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Caddy is an extensible server platform that uses TLS by default. From version 2.7.5 to before version 2.11.2, the vars_regexp matcher in vars.go:337 double-expands user-controlled input through the Caddy replacer. When vars_regexp matches against a placeholder like {http.request.header.X-Input}, the header value gets resolved once (expected), then passed through repl.ReplaceAll() again (the bug). This means an attacker can put {env.DATABASE_URL} or {file./etc/passwd} in a request header and the server will evaluate it, leaking environment variables, file contents, and system info. This issue has been patched in version 2.11.2."
                }
            ],
            "source": {
                "advisory": "GHSA-m2w3-8f23-hxxf",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-03-09T18:19:34.437219Z",
                                "id": "CVE-2026-30852",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-03-09T18:24:55.495Z"
                }
            }
        ]
    }
}