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CVE-2026-33054— Mesop: Path Traversal utilizing `FileStateSessionBackend` leads to Application Denial of Service and File Write/Deletion

Quick assessment

Affected
mesop-dev mesop
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.

Mesop是Mesop开源的一个快速构建Python Web应用的UI框架。 Mesop 1.2.2及之前版本存在安全漏洞，该漏洞源于state_token参数存在路径遍历问题，可能导致拒绝服务或任意文件操作。

CVSS 10.0 · Critical EPSS 0.70% · P52
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I. Basic Information for CVE-2026-33054

Vulnerability Information
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Vulnerability Title
Mesop: Path Traversal utilizing `FileStateSessionBackend` leads to Application Denial of Service and File Write/Deletion
Source: CVE Program / CVE List V5
Vulnerability Description
Mesop is a Python-based UI framework that allows users to build web applications. Versions 1.2.2 and below contain a Path Traversal vulnerability that allows any user supplying an untrusted state_token through the UI stream payload to arbitrarily target files on the disk under the standard file-based runtime backend. This can result in application denial of service (via crash loops when reading non-msgpack target files as configurations), or arbitrary file manipulation. This vulnerability heavily exposes systems hosted utilizing FileStateSessionBackend. Unauthorized malicious actors could interact with arbitrary payloads overwriting or explicitly removing underlying service resources natively outside the application bounds. This issue has been fixed in version 1.2.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/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
Mesop 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mesop是Mesop开源的一个快速构建Python Web应用的UI框架。 Mesop 1.2.2及之前版本存在安全漏洞，该漏洞源于state_token参数存在路径遍历问题，可能导致拒绝服务或任意文件操作。
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)

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Affected Products

Vendor Product Affected Versions CPE Subscribe
mesop-dev mesop < 1.2.3 -

II. Public POCs for CVE-2026-33054

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III. Intelligence Information for CVE-2026-33054

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Patches & Fixes for CVE-2026-33054 (1)

Vendor Advisories for CVE-2026-33054 (1)

Vendor Pages for CVE-2026-33054 (1)

IV. Related Vulnerabilities

Same product: mesop
Same vendor: mesop-dev
Same weakness: CWE-22

V. Comments for CVE-2026-33054

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