What is CVE-2026-34730?

CVE-2026-34730 is a medium-severity vulnerability in Copier-org Copier, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-04-02.

How severe is CVE-2026-34730?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Path Traversal in Copier-org Copier

CVE-2026-34730

Copier is a library and CLI app for rendering project templates. Prior to version 9.14.1, Copier's _external_data feature allows a template to load YAML files using template-controlled paths. If untrusted templates are in scope, a maliciou…

Vulnerability class: Path Traversal (Directory Traversal)

EPSS: 0.000 (0.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/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-hgjq-p8cr-gg4h (x_refsource_CONFIRM)
https://github.com/copier-org/copier/commit/5413062eb17b73dc885f5e645cdc161e69ef641b (x_refsource_MISC)
https://github.com/copier-org/copier/releases/tag/v9.14.1 (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-34730?: CVE-2026-34730 is a medium-severity vulnerability in Copier-org Copier, classified under Path Traversal. CVSS score: 5.5/10. Published 2026-04-02.
How severe is CVE-2026-34730?: Medium severity. CVSS v3 base score is 5.5 out of 10.