What is CVE-2026-34726?

CVE-2026-34726 is a medium-severity vulnerability in Copier-org Copier, classified under Path Traversal. CVSS score: 4.4/10. Published 2026-04-02.

How severe is CVE-2026-34726?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Path Traversal in Copier-org Copier

CVE-2026-34726

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _subdirectory setting is documented as the subdirectory to use as the template root. However, the current implementation accepts parent-dire…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (7.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

Affected products

Copier-org Copier — versions < 9.14.1

Weakness classification (CWE)

CWE-22 — Path Traversal

References

https://github.com/copier-org/copier/security/advisories/GHSA-85v3-4m8g-hrh6 (x_refsource_CONFIRM)
https://github.com/copier-org/copier/commit/cb80a3ffc9c3787de3ed837e04ca29a0ff8ca3df (x_refsource_MISC)
https://github.com/copier-org/copier/releases/tag/v9.14.1 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34726?: CVE-2026-34726 is a medium-severity vulnerability in Copier-org Copier, classified under Path Traversal. CVSS score: 4.4/10. Published 2026-04-02.
How severe is CVE-2026-34726?: Medium severity. CVSS v3 base score is 4.4 out of 10.