CVE-2026-62999: high-severity vulnerability in copier-org copier
Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)
Published
E-mail alert when it lands in KEV, gets a public PoC or its score goes up.
21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.5epss 0.4%
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
Affected products
copier-org · copierRelated CVEs — copier-org copier
In the same product, most dangerous first.
CVE-2026-34726MEDIUMCopier `_subdirectory` allows template root escape via parent-directory traversalEPSS 0.4%CVE-2026-34730MEDIUMCopier `_external_data` allows path traversal and absolute-path local file read without unsafe modeEPSS 0.3%CVE-2026-23986MEDIUMCopier safe template has arbitrary filesystem write access via directory symlinks when _preserve_symlinks: trueEPSS 0.3%CVE-2025-55214MEDIUMCopier safe template has filesystem write access outside destination pathEPSS 0.3%CVE-2026-53951HIGHCopier: trust-prefix bypass via path traversal runs tasks unpromptedEPSS 0.3%CVE-2025-55201HIGHCopier safe template has arbitrary filesystem read/write accessEPSS 0.3%