CVE-2026-27734

{"id": "CVE-2026-27734", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27734", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-03-02T12:51:38.292112Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 6.5, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.8}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "henrygd", "product": "beszel", "versions": [{"status": "affected", "version": "< 0.18.4"}]}]}], "published": "2026-02-27T20:21:38.950", "references": [{"url": "https://github.com/henrygd/beszel/releases/tag/v0.18.4", "tags": ["Product", "Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/henrygd/beszel/security/advisories/GHSA-phwh-4f42-gwf3", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-22"}]}], "descriptions": [{"lang": "en", "value": "Beszel is a server monitoring platform. Prior to version 0.18.2, the hub's authenticated API endpoints GET /api/beszel/containers/logs and GET /api/beszel/containers/info pass the user-supplied \"container\" query parameter to the agent without validation. The agent constructs Docker Engine API URLs using fmt.Sprintf with the raw value instead of url.PathEscape(). Since Go's http.Client does not sanitize `../` sequences from URL paths sent over unix sockets, an authenticated user (including readonly role) can traverse to arbitrary Docker API endpoints on agent hosts, exposing sensitive infrastructure details. Version 0.18.4 fixes the issue."}, {"lang": "es", "value": "Beszel es una plataforma de monitorizaci\u00f3n de servidores. Antes de la versi\u00f3n 0.18.2, los endpoints autenticados de la API del hub GET /api/beszel/containers/logs y GET /api/beszel/containers/info pasaban el par\u00e1metro de consulta 'container' proporcionado por el usuario al agente sin validaci\u00f3n. El agente construye URLs de la API de Docker Engine usando fmt.Sprintf con el valor sin procesar en lugar de url.PathEscape(). Dado que el http.Client de Go no sanitiza las secuencias '../' de las rutas URL enviadas a trav\u00e9s de sockets Unix, un usuario autenticado (incluido el rol de solo lectura) puede acceder a endpoints arbitrarios de la API de Docker en los hosts del agente, exponiendo detalles sensibles de la infraestructura. La versi\u00f3n 0.18.4 corrige el problema."}], "lastModified": "2026-06-17T10:27:34.413", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:beszel:beszel:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "E3248EB7-FB3C-4F5E-9EA7-8F74CF7B541F", "versionEndExcluding": "0.18.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}