漏洞信息
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Vulnerability Title
Flask-Reuploaded: Extension-denylist bypass via case-folding asymmetry in name-override path (incomplete-fix variant of CVE-2026-27641)
Vulnerability Description
Flask-Reuploaded provides file uploads for Flask. From 1.5.0 until 1.6.0, UploadSet.save(storage, name=...) in src/flask_uploads/flask_uploads.py applies lowercase_ext to the default upload path but uses the case-preserving extension helper for a caller-supplied name before extension_allowed evaluates an AllExcept denylist. An attacker who controls the name override can use a mixed-case dangerous extension to bypass a lowercase denylist and store the file in the served upload directory. Exploitation requires a denylist configuration, a user-influenced name override, and a deployment that resolves or executes extensions case-insensitively; pure allowlists remain protected and path containment is not bypassed. On an execution-capable upload directory, the stored file can execute with the web server's privileges and affect confidentiality, integrity, and availability. This issue is fixed in version 1.6.0.
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Vulnerability Type
大小写敏感处理不恰当
Vulnerability Title
Jürgen Gmach Flask-Reuploaded 输入验证错误漏洞
Vulnerability Description
Jürgen Gmach Flask-Reuploaded是Jürgen Gmach个人开发者的一个为网络应用提供文件上传处理功能的轻量级扩展。 Jürgen Gmach Flask-Reuploaded 1.5.0至1.6.0之前版本存在安全漏洞,该漏洞源于src/flask_uploads/flask_uploads.py中UploadSet.save函数对调用者提供的name参数使用保留大小写的扩展名处理,而未像默认上传路径一样应用lowercase_ext,导致攻击者可通过混合大小写的危险扩展名绕
CVSS Information
N/A
Vulnerability Type
N/A