← Back to CVEs

CVE-2026-34730

MEDIUM

5.5

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.

CVE Details

CVSS v3.1 Score5.5

SeverityMEDIUM

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredNONE

User InteractionREQUIRED

Published4/2/2026

Last Modified4/3/2026

Sourcenvd

Honeypot Sightings0

Affected Products

copier-org:copier

Weaknesses (CWE)

CWE-22

References

https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69ef641b(security-advisories@github.com)

https://github.com/copier-org/copier/releases/tag/v9.14.1(security-advisories@github.com)

https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h(security-advisories@github.com)

https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4h(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.