CVE-2026-27734

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{"affected": [{"affectedData": [{"product": "beszel", "vendor": "henrygd", "versions": [{"status": "affected", "version": "< 0.18.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:beszel:beszel:*:*:*:*:*:*:*:*", "matchCriteriaId": "E3248EB7-FB3C-4F5E-9EA7-8F74CF7B541F", "versionEndExcluding": "0.18.2", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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."}], "id": "CVE-2026-27734", "lastModified": "2026-06-17T10:27:34.413", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 6.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-27734", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-02T12:51:38.292112Z", "version": "2.0.3"}}]}, "published": "2026-02-27T20:21:38.950", "references": [{"source": "security-advisories@github.com", "tags": ["Product", "Release Notes"], "url": "https://github.com/henrygd/beszel/releases/tag/v0.18.4"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Vendor Advisory"], "url": "https://github.com/henrygd/beszel/security/advisories/GHSA-phwh-4f42-gwf3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-22"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,0.18.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "beszel", "source": "cna", "vendor": "henrygd"}, "product": "beszel", "vendor": "henrygd"}], "analysis": {"en": {"generated_at": "2026-04-16T15:20:19.977400+00:00", "value": {"mitigation_remediation": ["Upgrade Beszel to version 0.18.4 or later, which sanitizes the container identifier", "Restrict authenticated API access to users who absolutely require it and enforce least privilege for services interacting with Beszel", "Implement input validation or use URL encoding such as url.PathEscape() on any container identifiers before constructing Docker Engine API URLs"], "summary": {"action": "Patch", "impact": "Information Disclosure"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the Beszel platform released by henrygd. All releases earlier than 0.18.2 are impacted; the issue was fixed in 0.18.4. Administrators should confirm that their deployments are running a patched version.", "description_and_impact": "Beszel is a server monitoring platform. Prior to version 0.18.2 its authenticated API endpoints pass the user\u2011supplied \"container\" query parameter to the agent without validation. Because the agent uses the raw value when forming Docker Engine API URLs, an authenticated user\u2014including those with a read\u2011only role\u2014can inject \"../\" sequences to traverse to arbitrary Docker API endpoints on the agent host. This path traversal flaw (CWE\u201122) allows an attacker to access sensitive infrastructure details, such as container configurations and logs, and potentially perform actions exposed by the Docker API.", "risk_and_exploitability": "The CVSS score is 6.5 and the EPSS indicates a very low exploitation probability (<1%), and the issue is not listed in the CISA KEV catalog. Exploitation requires an authenticated session to Beszel, after which the attacker can issue arbitrary Docker Engine commands through the agent. While the current threat of exploitation is low, the impact on confidentiality is substantial, warranting prompt remediation."}}}}, "created": "2026-03-02T12:05:07.238222+00:00", "updated": "2026-04-16T15:30:06.215744+00:00", "vendors": ["henrygd", "henrygd$PRODUCT$beszel"]}