{"id":"CVE-2026-40611","revision":"d3daef2a13a8442c81964c18092538f2","records":[{"revision":"d3daef2a13a8442c81964c18092538f2","observedAt":"2026-10-27T10:10:07.342+00:00","statement":{"source":"nvd","id":"CVE-2026-40611","aliases":[],"title":"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 …","description":"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.","state":0,"publishedAt":"2026-04-21T18:16:52.457+00:00","modifiedAt":"2026-10-26T21:10:00.17+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"},{"system":"CVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":8.8,"severity":"HIGH"}],"references":["https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8","https://access.redhat.com/errata/RHSA-2026:21772","https://access.redhat.com/security/cve/CVE-2026-40611","https://bugzilla.redhat.com/show_bug.cgi?id=2460233","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40611.json"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-40611","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-22"],"productCriteria":[],"sourceDates":{"published":"2026-04-21T18:16:52.457","lastModified":"2026-10-26T21:10:00.170"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-40611","identifiers":["CVE-2026-40611"]},"retained":false,"historicalAffected":[]}],"coverage":[]}