CVE-2026-34730

Published: Apr 02, 2026 Last Modified: Apr 02, 2026
ExploitDB:
Other exploit source:
Google Dorks:
MEDIUM 5,5
Source: [email protected]
Attack Vector: local
Attack Complexity: low
Privileges Required: none
User Interaction: required
Scope: unchanged
Confidentiality: high
Integrity: none
Availability: none

Description

AI Translation Available

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.

22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Stable
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Integrity Confidentiality Availability
Potential Impacts:
Execute Unauthorized Code Or Commands Modify Files Or Directories Read Files Or Directories Dos: Crash, Exit, Or Restart
Applicable Platforms
Technologies: AI/ML
Likelihood of Exploit: High
View CWE Details
https://github.com/copier-org/copier/commit/5413062eb17b73d…
https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69e…
https://github.com/copier-org/copier/releases/tag/v9.14.1
https://github.com/copier-org/copier/releases/tag/v9.14.1
https://github.com/copier-org/copier/security/advisories/GH…
https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h