CVE-2026-34726
However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root.
Does this matter?
Lower severity and a low EPSS score (0.38%). 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 _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-directory traversal such as .. and uses it directly when selecting the template root. As a result, a template can escape its own directory and make Copier render files from the parent directory without --UNSAFE. This issue has been patched in version 9.14.1.
- CVSS 3.1
- 4.4 MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
- EPSS
- 0.38% probability · 32th 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/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3dfPatch
- https://github.com/copier-org/copier/releases/tag/v9.14.1Release Notes
- https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6Exploit, Vendor Advisory
- https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6Exploit, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.