CVE-2026-34730

5.5 MEDIUM
Published: April 02, 2026 Modified: April 03, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/copier-org/copier/releases/tag/v9.14.1
Source: security-advisories@github.com
Release Notes
https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h
Source: security-advisories@github.com
Exploit Vendor Advisory
https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
Exploit Vendor Advisory

4 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.5 / 10.0
EPSS (Exploit Probability)
0.0%
1th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

copier-org