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CVE-2026-53951— Copier: trust-prefix bypass via path traversal runs tasks unprompted

Quick assessment

Affected
copier-org copier
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Copier是Copier团队开源的一个用于渲染项目模板的库。 Copier 9.5.0版本至9.15.1版本存在安全漏洞，该漏洞源于trust设置中的前缀匹配未进行路径规范化，可能导致攻击者通过特制的模板引用（包含../）绕过信任检查，从而执行任意命令。

AI Predicted 9.8 Difficulty: Easy EPSS 0.26% · P17

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
copier-org copier >= 9.5.0, < 9.15.2 affected
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I. Basic Information for CVE-2026-53951

Vulnerability Information
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Vulnerability Title
Copier: trust-prefix bypass via path traversal runs tasks unprompted
Source: CVE Program / CVE List V5
Vulnerability Description
Copier is a library and CLI app for rendering project templates. In versions 9.5.0 through 9.15.1, the `trust` setting's prefix match (`copier/_settings.py`) compares the template URL against a trusted prefix with a raw `str.startswith` and no path normalization, while the URL is normalized when the template is actually fetched (`Path.resolve()` for local paths; libcurl dot-segment removal for `https`). A template reference that textually starts with a trusted prefix but contains `..` is therefore granted trust yet resolves to a different, attacker-controlled template, whose `tasks` / `migrations` / `jinja_extensions` then run without the `--trust` prompt — arbitrary command execution. Version 9.15.2 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Copier 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Copier是Copier团队开源的一个用于渲染项目模板的库。 Copier 9.5.0版本至9.15.1版本存在安全漏洞，该漏洞源于trust设置中的前缀匹配未进行路径规范化，可能导致攻击者通过特制的模板引用（包含../）绕过信任检查，从而执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
copier-org copier >= 9.5.0, < 9.15.2 -

II. Public POCs for CVE-2026-53951

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III. Intelligence Information for CVE-2026-53951

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Vendor Advisories for CVE-2026-53951 (1)

Vendor Pages for CVE-2026-53951 (1)

IV. Related Vulnerabilities

Same product: copier
Same vendor: copier-org
Same weakness: CWE-22

V. Comments for CVE-2026-53951

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