{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40611", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-04-14T14:07:59.642Z", "datePublished": "2026-04-21T17:58:35.221Z", "dateUpdated": "2026-04-21T19:17:54.210Z"}, "containers": {"cna": {"title": "Lego: Arbitrary File Write via Path Traversal in Webroot HTTP-01 Provider", "problemTypes": [{"descriptions": [{"cweId": "CWE-22", "lang": "en", "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8"}], "affected": [{"vendor": "go-acme", "product": "lego", "versions": [{"version": "< 4.34.0", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-04-21T17:58:35.221Z"}, "descriptions": [{"lang": "en", "value": "Let's Encrypt client and ACME library written in Go (Lego). Prior to 4.34.0, the webroot HTTP-01 challenge provider in lego is vulnerable to arbitrary file write and deletion via path traversal. A malicious ACME server can supply a crafted challenge token containing ../ sequences, causing lego to write attacker-influenced content to any path writable by the lego process. This vulnerability is fixed in 4.34.0."}], "source": {"advisory": "GHSA-qqx8-2xmm-jrv8", "discovery": "UNKNOWN"}}, "adp": [{"references": [{"url": "https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-21T19:17:50.782641Z", "id": "CVE-2026-40611", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-21T19:17:54.210Z"}}]}}

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