CVE-2026-23968— Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false
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开源的一个用于渲染项目模板的库。 Copier 9.11.2之前版本存在安全漏洞，该漏洞源于使用符号链接和默认设置可能导致包含本地模板克隆位置之外的文件或目录。
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I. Basic Information for CVE-2026-23968
Vulnerability Information
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Vulnerability Title
Copier safe template has arbitrary filesystem read access via symlinks when _preserve_symlinks: false
Source: CVE Program / CVE List V5
Vulnerability Description
Copier is a library and CLI app for rendering project templates. Prior to version 9.11.2, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently include arbitrary files/directories outside the local template clone location by using symlinks along with `_preserve_symlinks: false` (which is Copier's default setting). Version 9.11.2 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-61
Source: CVE Program / CVE List V5
Vulnerability Title
Copier 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Copier是Copier开源的一个用于渲染项目模板的库。 Copier 9.11.2之前版本存在安全漏洞，该漏洞源于使用符号链接和默认设置可能导致包含本地模板克隆位置之外的文件或目录。
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 | < 9.11.2 | - |
|
II. Public POCs for CVE-2026-23968
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-23968 (1)
IV. Related Vulnerabilities
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Same vendor: copier-org
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CVE-2026-62999
Copier: Percent-encoded dot segments in template URLs can al -
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Copier: trust-prefix bypass via path traversal runs tasks un -
CVE-2026-34730
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Copier `_subdirectory` allows template root escape via paren -
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Same weakness: CWE-61
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V. Comments for CVE-2026-23968
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