Security readout for executives and security teams
Plain-English summary
Dagu versions 1.16.7 and earlier let a user who can create DAGs write YAML files outside the intended DAG directory. Because Dagu can execute DAG definitions as shell commands, this can become remote code execution if abused to place malicious DAGs or overwrite sensitive configuration.
Executive priority
Treat as high priority if Dagu is used in production or by semi-trusted teams. The issue can turn workflow-authoring access into broader system compromise, depending on filesystem permissions and deployment design.
Technical view
The CreateNewDAG API endpoint, POST /api/v1/dags, does not validate the DAG name before passing it to file storage. This is a path traversal issue, CWE-22. The advisory states an authenticated user with DAG write permissions can write arbitrary YAML files within the Dagu process permissions. Commit e2ed589105d79273e4e6ac8eb31525f765bb3ce4 fixes it.
Likely exposure
Organizations running dagu-org Dagu version 1.16.7 or earlier are potentially exposed, especially where the Web UI or API is reachable by multiple users or integrated automation accounts with DAG write access.
Exploitation context
Provided sources do not report active exploitation, and the CVE is not marked KEV. Abuse requires the ability to create DAGs according to the advisory, but impact can be serious because file writes may lead to command execution through Dagu workflows.
Researcher notes
Evidence is limited to the CVE record, GitHub advisory, and fix commit. The advisory describes arbitrary YAML file write outside the DAGs directory and possible RCE through Dagu execution behavior. No public exploitation evidence is provided in the source bundle.
Mitigation direction
- Upgrade to a Dagu release containing commit e2ed589105d79273e4e6ac8eb31525f765bb3ce4.
- If no packaged release is available, follow Dagu vendor guidance for applying the fix.
- Restrict DAG write permissions to trusted users and service accounts.
- Run Dagu with least-privilege filesystem permissions.
- Limit network access to the Dagu Web UI and API.
- Review Dagu configuration for unsafe shared DAG directories across instances.
Validation and detection
- Inventory all Dagu deployments and record versions.
- Flag Dagu versions 1.16.7 and earlier for remediation.
- Confirm the fix commit is present in deployed builds.
- Review who has DAG write permissions.
- Check logs for unusual DAG creation activity or unexpected file path patterns.
- Verify the Dagu process cannot write outside required directories.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-22: File access and web shell behavior lookup
File traversal and upload weaknesses can lead teams to review file, web shell, execution, and collection telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupFile access behavior lookup
The CVE wording references file access or upload behavior, so file telemetry and web shell review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-27598 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- High
- CVSS
- 7.1 (4.0)
- Known Exploited
- No
- Published
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
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
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——Primary CVE scoreVulnerability scoring details
Base CVSS 4.0 score
7.1HighVector: 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
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/dagu-org/dagu/security/advisories/GHSA-6v48-fcq6-ff23CVE reference · x_refsource_CONFIRM
- https://github.com/dagu-org/dagu/commit/e2ed589105d79273e4e6ac8eb31525f765bb3ce4CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.