CVE-2026-62999CWE-180CWE-22path-traversal

CVE-2026-62999

High · published August 1, 2026

CVSS v3.1
7.5
EPSS
0%
Percentile
37.3
In the wild
Unconfirmed
What it 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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00441 · 37.3th percentile
Weaknesses
CWE-180 · Incorrect Behavior Order: Validate Before Canonicalize; CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Published
2026-08-01T00:16Z
References (4)
https://github.com/copier-org/copier/commit/7408f0d6287a7bf452715fd9f25dc54eaba3c295 · [email protected]https://github.com/copier-org/copier/releases/tag/v9.17.0 · [email protected]https://github.com/copier-org/copier/security/advisories/GHSA-34mv-rjq9-5mch · [email protected]https://github.com/copier-org/copier/security/advisories/GHSA-34mv-rjq9-5mch · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 31 JUL 19:41Z
    Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)
    cvelistv5