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CVE-2026-62999— Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)

Quick assessment

Affected
copier-org copier
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

copier-org copier是copier-org组织开源的一个项目模板生成工具。 copier-org copier 9.5.0版本至9.16.0版本存在安全漏洞，该漏洞源于路径验证不当，模板URL中百分号编码的父目录段或编码路径分隔符在解码前可匹配受信任仓库前缀，导致用户交互后运行受信任前缀之外的仓库的不安全模板功能。

CVSS 7.5 · High EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1195.002 · Compromise Software Supply Chain

Affected Version Matrix 1

VendorProduct Version RangeStatus
copier-org copier >= 9.5.0, <= 9.16.0 affected
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I. Basic Information for CVE-2026-62999

Vulnerability Information
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Vulnerability Title
Copier: Percent-encoded dot segments in template URLs can allow trusted-prefix escape (Incomplete fix for trust-prefix bypass)
Source: CVE Program / CVE List V5
Vulnerability Description
Copier is a library and CLI app for rendering project templates. From 9.5.0 through 9.16.0, percent-encoded parent-directory segments or encoded path separators in a template URL can match a configured trusted repository prefix before an HTTP server or Git transport decodes the path, allowing unsafe template features from a repository outside the trusted prefix to run after user interaction. This issue is fixed in version 9.17.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A: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-org copier 处理逻辑错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
copier-org copier是copier-org组织开源的一个项目模板生成工具。 copier-org copier 9.5.0版本至9.16.0版本存在安全漏洞，该漏洞源于路径验证不当，模板URL中百分号编码的父目录段或编码路径分隔符在解码前可匹配受信任仓库前缀，导致用户交互后运行受信任前缀之外的仓库的不安全模板功能。
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, <= 9.16.0 -

II. Public POCs for CVE-2026-62999

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 8268 chars
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III. Intelligence Information for CVE-2026-62999

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Patches & Fixes for CVE-2026-62999 (1)

Vendor Advisories for CVE-2026-62999 (1)

Vendor Pages for CVE-2026-62999 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-62999

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