Copier is a library and CLI app for rendering project templates.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Apr 2, 2026 · NIST NVD

   Detected

   Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-parseable local files that are accessible to the user running Copier and expose their contents in rendered output. This

2. Jul 24, 2026 · NIST NVD

   Updated

   Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-parseable local files that are accessible to the user running Copier and expose their contents in rendered output. This

Affected

• cpe copier-org/copierversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2026-34730

  Official CVE identifier

  cve.org
• NIST NVDVulnerability recordCVE-2026-34730

  Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a malicious template can read attacker-chosen YAML-

  nvd.nist.gov

References

• Patch · github.com
• Release Notes · github.com
• Exploit · github.com