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: 0.003 (20.9th 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

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Vendor Advisory)
security-advisories@github.com (Patch, x_refsource_MISC)
security-advisories@github.com (x_refsource_MISC, Release Notes)

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.