CVE-2026-77357— Mesop: DoS in /hot-reload endpoint allows unauthenticated attacker to exhaust worker threads and crash the server
Quick assessment
Affected
mesop-dev mesop
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.
Mesop 是一个基于 Python 的 UI 框架，允许用户构建 Web 应用程序。在 1.3.3 版本之前，以调试模式运行的 Mesop 应用会暴露一个 GET /hot-reload 端点，该端点中存在一个无界循环，其执行依赖于用户提供的 counter 参数。未授权的攻击者可以利用这一缺陷，通过传入极高的 counter 值来长期占用工作线程，直到工作线程池耗尽，导致服务器不可用。单个未授权攻击者只需极小的努力即可使 Mesop 服务器崩溃。由于该攻击利用了工作线程耗尽的机制，服务器在被手动重启之前将一直无
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I. Basic Information for CVE-2026-77357
Vulnerability Information
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Vulnerability Title
Mesop: DoS in /hot-reload endpoint allows unauthenticated attacker to exhaust worker threads and crash the server
Source: CVE Program / CVE List V5
Vulnerability Description
Mesop is a Python-based UI framework that allows users to build web applications. Prior to 1.3.3, applications running in debug mode expose a GET /hot-reload endpoint whose unbounded loop depends on the user-supplied counter parameter, allowing an unauthenticated attacker to hold worker threads with high counter values until the worker pool is exhausted and the server becomes unavailable. A single unauthenticated attacker can crash the Mesop server with minimal effort. Because the attack leverages worker exhaustion, the server remains unresponsive until it is manually restarted. This issue is fixed in version 1.3.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-77357
| # | POC Description | Source Link | Shenlong Link |
|---|
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Qwen3.6-35B-A3B
· 7777 chars
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III. Intelligence Information for CVE-2026-77357
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Patches & Fixes for CVE-2026-77357 (1)
Vendor Advisories for CVE-2026-77357 (1)
Vendor Pages for CVE-2026-77357 (1)
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V. Comments for CVE-2026-77357
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