VULNERABILITY INTELLIGENCE

CVE-2026-34730

CVSS score5.5 MEDIUM

EPSS probability0.30%

CISA KEVNot currently listed

Published2026-04-02

Last modified2026-07-24

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Description

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 issue has been patched in version 9.14.1.

Weakness classification

security-advisories@github.com: CWE-22

Primary references

security-advisories@github.com — Patch
security-advisories@github.com — Release Notes
security-advisories@github.com — Exploit, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0 — Exploit, Vendor Advisory