CVE-2026-34726
Last modified
CVE-2026-34726 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. 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. EPSS estimates a 0.38% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Copier-Org | Copier | < 9.14.1 |
References
- 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
Timeline
- Published
- Last Modified
- Status
- Analyzed
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