Vulnerability Description
Copier is a library and CLI app for rendering project templates. From 9.5.0 through 9.16.0, percent-encoded parent-directory segments or encoded path separators in a template URL can match a configured trusted repository prefix before an HTTP server or Git transport decodes the path, allowing unsafe template features from a repository outside the trusted prefix to run after user interaction. This issue is fixed in version 9.17.0.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/copier-org/copier/commit/7408f0d6287a7bf452715fd9f25dc54eaba3
- https://github.com/copier-org/copier/releases/tag/v9.17.0
- https://github.com/copier-org/copier/security/advisories/GHSA-34mv-rjq9-5mch
- https://github.com/copier-org/copier/security/advisories/GHSA-34mv-rjq9-5mch
FAQ
What is CVE-2026-62999?
CVE-2026-62999 is a vulnerability with a CVSS score of 7.5 (HIGH). Copier is a library and CLI app for rendering project templates. From 9.5.0 through 9.16.0, percent-encoded parent-directory segments or encoded path separators in a template URL can match a configure...
How severe is CVE-2026-62999?
CVE-2026-62999 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-62999?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.