copier-org copier up to 9.16.0 path traversal

Summaryinfo

A vulnerability identified as critical has been detected in copier-org copier up to 9.16.0. This vulnerability affects unknown code. This manipulation causes path traversal. This vulnerability is registered as CVE-2026-62999. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in copier-org copier up to 9.16.0. It has been declared as critical. Affected by this vulnerability is some unknown functionality. The manipulation with an unknown input leads to a path traversal vulnerability. The CWE definition for the vulnerability is CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-62999 since 07/15/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1006 according to MITRE ATT&CK.

Upgrading to version 9.17.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-51625). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• copier-org

Name

• copier

Version

• 9.0
• 9.1
• 9.2
• 9.3
• 9.4
• 9.5
• 9.6
• 9.7
• 9.8
• 9.9
• 9.10
• 9.11
• 9.12
• 9.13
• 9.14
• 9.15
• 9.16.0

Website

• Product: https://github.com/copier-org/copier/

CPE 2.3info

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Be aware that VulDB is the high quality source for vulnerability data.

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