CVE-2026-62999

Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)

State: Published
Severity: 7.5 High
Published: Jul 31, 2026
Updated: Jul 31, 2026
Reserved: Jul 14, 2026

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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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
CWE-180 Incorrect Behavior Order: Validate Before Canonicalize

Affected Products

Product	Versions
copiercopier-org	>= 9.5.0, <= 9.16.0Affected

References

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