CVE-2026-31886

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{"affected": [{"affectedData": [{"product": "dagu", "vendor": "dagu-org", "versions": [{"status": "affected", "version": "< 2.2.4"}]}], "source": "security-advisories@github.com"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:dagu:dagu:*:*:*:*:*:*:*:*", "matchCriteriaId": "681DF7E8-8500-4F63-8E04-FC8AB4CAFD3A", "versionEndExcluding": "2.2.4", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Dagu is a workflow engine with a built-in Web user interface. Prior to 2.2.4, the dagRunId request field accepted by the inline DAG execution endpoints is passed directly into filepath.Join to construct a temporary directory path without any format validation. Go's filepath.Join resolves .. segments lexically, so a caller can supply a value such as \"..\" to redirect the computed directory outside the intended /tmp/<name>/<id> path. A deferred cleanup function that calls os.RemoveAll on that directory then runs unconditionally when the HTTP handler returns, deleting whatever directory the traversal resolved to. With dagRunId set to \"..\", the resolved directory is the system temporary directory (/tmp on Linux). On non-root deployments, os.RemoveAll(\"/tmp\") removes all files in /tmp owned by the dagu process user, disrupting every concurrent dagu run that has live temp files. On root or Docker deployments, the call removes the entire contents of /tmp, causing a system-wide denial of service. This vulnerability is fixed in 2.2.4."}, {"lang": "es", "value": "Dagu es un motor de flujo de trabajo con una interfaz de usuario web integrada. Antes de la versi\u00f3n 2.2.4, el campo de solicitud dagRunId aceptado por los puntos finales de ejecuci\u00f3n de DAG en l\u00ednea se pasa directamente a filepath.Join para construir una ruta de directorio temporal sin ninguna validaci\u00f3n de formato. filepath.Join de Go resuelve los segmentos '..' l\u00e9xicamente, por lo que un llamador puede proporcionar un valor como '..' para redirigir el directorio calculado fuera de la ruta prevista /tmp//. Una funci\u00f3n de limpieza diferida que llama a os.RemoveAll en ese directorio se ejecuta incondicionalmente cuando el gestor HTTP regresa, eliminando cualquier directorio al que se resolvi\u00f3 el recorrido. Con dagRunId establecido en '..', el directorio resuelto es el directorio temporal del sistema (/tmp en Linux). En despliegues sin privilegios de root, os.RemoveAll('/tmp') elimina todos los archivos en /tmp propiedad del usuario del proceso dagu, interrumpiendo cada ejecuci\u00f3n concurrente de dagu que tiene archivos temporales activos. En despliegues con privilegios de root o Docker, la llamada elimina todo el contenido de /tmp, causando una denegaci\u00f3n de servicio a nivel de sistema. Esta vulnerabilidad se corrige en la versi\u00f3n 2.2.4."}], "id": "CVE-2026-31886", "lastModified": "2026-06-17T10:34:41.853", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 3.1, "impactScore": 5.3, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.6, "baseSeverity": "HIGH", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 4.7, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-31886", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-13T19:43:07.610905Z", "version": "2.0.3"}}]}, "published": "2026-03-13T19:54:37.690", "references": [{"source": "security-advisories@github.com", "tags": ["Patch"], "url": "https://github.com/dagu-org/dagu/commit/12c2e5395bd9331d49ca103593edfd0db39c4f38"}, {"source": "security-advisories@github.com", "tags": ["Exploit", "Mitigation", "Vendor Advisory"], "url": "https://github.com/dagu-org/dagu/security/advisories/GHSA-m4q3-457p-hh2x"}], "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": "[0,2.2.4)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "dagu", "source": "cna", "vendor": "dagu-org"}, "product": "dagu", "vendor": "dagu-org"}], "analysis": {"en": {"generated_at": "2026-03-18T16:24:26.941706+00:00", "value": {"mitigation_remediation": ["Upgrade Dagu to version 2.2.4 or later to apply the vendor fix.", "If an immediate upgrade is not possible, restrict network access to the inline DAG execution endpoints to trusted hosts or disable the inline execution feature until a patch is applied.", "After applying the fix, verify that the temporary directory path is correctly constrained and monitor / to ensure no unexpected deletions occur."], "summary": {"action": "Immediate Patch", "impact": "System-wide Denial of Service"}, "threat_synthesis": {"affected_systems": "The affected product is Dagu from vendor dagu-org. Versions prior to 2.2.4, as identified by the CPE cpe:2.3:a:dagu:dagu:*:*:*:*:*:*:*:* are vulnerable. The issue exists in the inline DAG execution endpoints of the web UI.", "description_and_impact": "Dagu is a workflow engine that uses a web UI to execute inline DAGs. Prior to version 2.2.4, the dagRunId request field is concatenated into a temporary directory path using filepath.Join without sanitization. Because Go\u2019s filepath.Join treats .. segments lexically, a requester can supply a value such as \"..\" which causes the resolved directory to point outside the intended /tmp/<name>/<id> location. The code then runs a cleanup that calls os.RemoveAll on this directory, deleting whatever path was resolved. Consequently, a crafted request can delete arbitrary files or directories. When dagRunId is \"..\", the resulting path is the system temporary directory (/tmp on Linux). For non\u2011root deployments, this deletes all files in /tmp that belong to the dagu process user and disrupts concurrent runs. For root or container deployments, it removes the entire /tmp contents, leading to a system\u2011wide denial of service. The vulnerability is a classic CWE\u201122 Path Traversal flaw and the impact is catastrophic file removal and availability loss.", "risk_and_exploitability": "The CVSS score for this vulnerability is 9.1, indicating a high\u2011severity risk. The EPSS score is reported as less than 1%, suggesting a low likelihood of widespread exploitation at the moment, and the problem is not listed in the CISA KEV catalog. Attack conditions require the ability to send an HTTP request to the inline DAG execution endpoint with a crafted dagRunId value (e.g., \"..\"). The path traversal can be performed over the network if the Dagu UI is exposed, so remote attackers with network access to the service can potentially exploit it. Once exploited, the attacker can cause either localized trouble\u2014deleting temporary files used by the dagu process on non\u2011privileged deployments\u2014or a full system denial of service when running as root or within a Docker container. Inferred from the description, the primary vector is a remote HTTP request to an exposed endpoint, although the description does not state the exact exposure level."}}}}, "created": "2026-03-16T09:24:14.719058+00:00", "updated": "2026-03-23T13:40:11.397808+00:00", "vendors": ["dagu-org", "dagu-org$PRODUCT$dagu"]}