CVE-2025-55201 - CVE House
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Status published High CVE-2025-55201

Copier safe template has arbitrary filesystem read/write access

Vulnerability Description

Copier library and CLI app for rendering project templates. Prior to 9.9.1, a safe template can currently read and write arbitrary files because Copier exposes a few pathlib.Path objects in the Jinja context which have unconstrained I/O methods. This effectively renders the security model w.r.t. filesystem access useless. This vulnerability is fixed in 9.9.1.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from copier-org

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CVE-2025-55214
Copier safe template has filesystem write access outside destination path
Medium 6.9

Affected Vendor

Affected Software

copier
Vulnerable Versions:
< 9.9.1

Timeline

Official Publish: August 18th, 2025
Last Modified: August 18th, 2025
Added to House: July 22nd, 2026

CVSS Vectors

Weaknesses (CWE)

CWE-22

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application
Initial Access
T1005 Data from Local System
Collection
T1552 Unsecured Credentials
Credential Access
T1565.001 Stored Data Manipulation
Impact