{"id":"CVE-2026-40611","sourceIdentifier":"security-advisories@github.com","published":"2026-04-21T18:16:52.457","lastModified":"2026-10-26T21:10:00.170","vulnStatus":"Deferred","cveTags":[],"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."},{"lang":"es","value":"Cliente de Let’s Encrypt y biblioteca ACME escrita en Go (Lego). Antes de la versión 4.34.0, el proveedor del desafío webroot HTTP-01 en lego es vulnerable a la escritura y eliminación arbitraria de archivos a través de salto de ruta. Un servidor ACME malicioso puede suministrar un token de desafío manipulado que contiene secuencias .. / , causando que lego escriba contenido influenciado por el atacante en cualquier ruta escribible por el proceso de lego. Esta vulnerabilidad está corregida en la versión 4.34.0."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"go-acme","product":"lego","versions":[{"version":"< 4.34.0","status":"affected"}]}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","affectedData":[{"vendor":"Red Hat","product":"Red Hat OpenShift Dev Spaces 3.28","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"devspaces/traefik-rhel9","cpes":["cpe:/a:redhat:openshift_devspaces:3.28::el9"],"versions":[{"version":"1779786779","lessThan":"*","versionType":"rpm","status":"unaffected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-04-21T19:17:50.782641Z","id":"CVE-2026-40611","options":[{"exploitation":"poc"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-22"}]},{"source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c","type":"Secondary","description":[{"lang":"en","value":"CWE-22"}]}],"references":[{"url":"https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8","source":"security-advisories@github.com"},{"url":"https://access.redhat.com/errata/RHSA-2026:21772","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://access.redhat.com/security/cve/CVE-2026-40611","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2460233","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://github.com/go-acme/lego/security/advisories/GHSA-qqx8-2xmm-jrv8","source":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40611.json","source":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}]}