CVE-2026-62999

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 v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 1.6 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/copier-org/copier/commit/7408f0d6287a7bf452715fd9f25dc54eaba3c295
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-07-31 20:16

Updated : 2026-09-09 20:55

NVD link : CVE-2026-62999

Mitre link : CVE-2026-62999

CVE.ORG link : CVE-2026-62999

JSON object : View

Products Affected

No product.

CWE

CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CWE-180

Incorrect Behavior Order: Validate Before Canonicalize

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