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Vulnerability record · CVE-2026-62999 · published 31 July 2026

CVE-2026-62999: Path traversal vulnerability

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.

7.5 CVSS 3.1 High EPSS 0.44% · top 64.1% CWE-22 · Path traversalCWE-180 · CWE-180 Deferred
7.5CVSS 3.1 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
9 Sep 2026Last modified by NVD

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:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References

LinkTags
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

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Source: NIST National Vulnerability Database (record CVE-2026-62999), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.