CVE-2026-34730
Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths.
Does this matter?
Lower severity and a low EPSS score (0.29%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 0.29% probability · 21th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-22
- Affected
- copier-org/copier
- Source
- security-advisories@github.com
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.