CVE-2026-62999

HIGH

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

Title source: CVE List
STIX 2.1 vulnerability

Record summary

CVE-2026-62999 has a selected CVSS score of 7.5 (high).

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.

Description source: CVE List

Exploitation context

CISA SSVC decision

ExploitationPoC
AutomatableNo
Technical impactTotal

CISA Coordinator · SSVC 2.0.3 · Evaluated Jul 31, 2026 · Source: CVE List

Affected products and versions

1
ProductSourceVersion range

copier

Browse copier-org / copier
CVE List>= 9.5.0, <= 9.16.0affected

References

3