Path Traversal in Dagu
CVE-2026-27598
Dagu is a workflow engine with a built-in Web user interface. In versions up to and including 1.16.7, the `CreateNewDAG` API endpoint (`POST /api/v1/dags`) does not validate the DAG name before passing it to the file store. An authenticated user with DAG write permissions can write arbitrary YAML files anywhere on the filesystem (limited by the process permissions). Since dagu executes DAG files as shell commands, writing a malicious DAG to the DAGs directory of another instance or overwriting config files can lead to remote code execution. Commit e2ed589105d79273e4e6ac8eb31525f765bb3ce4 fixes the issue.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.006 (43.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
Affected products
- Dagu
- Dagu-org Dagu — versions <= 1.16.7
Weakness classification (CWE)
References
- security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-27598?
- CVE-2026-27598 is a medium-severity vulnerability in Dagu, classified under Path Traversal. CVSS score: 6.5/10. Published 2026-02-25.
- How severe is CVE-2026-27598?
- Medium severity. CVSS v3 base score is 6.5 out of 10.