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.
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Fixes

Solution

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Workaround

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History

Fri, 31 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Copier-org
Copier-org copier
Vendors & Products Copier-org
Copier-org copier

Fri, 31 Jul 2026 20:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Fri, 31 Jul 2026 19:45:00 +0000

Type Values Removed Values Added
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.
Title Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)
Weaknesses CWE-180
CWE-22
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-07-31T19:59:30.346Z

Reserved: 2026-07-14T23:10:57.032Z

Link: CVE-2026-62999

cve-icon Vulnrichment

Updated: 2026-07-31T19:59:25.678Z

cve-icon NVD

Status : Received

Published: 2026-07-31T20:16:53.523

Modified: 2026-07-31T20:16:53.523

Link: CVE-2026-62999

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-02T04:00:06Z

Weaknesses