CVE-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-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.

• CWE-22

• https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69ef641bPatch
• https://github.com/copier-org/copier/releases/tag/v9.14.1Release Notes
• https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4hExploit, Vendor Advisory
• https://github.com/copier-org/copier/security/advisories/GHSA-hgjq-p8cr-gg4hExploit, Vendor Advisory

Published

Apr 2, 2026

Last Modified

Jul 24, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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