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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Mesop团队的一个面向Web应用的开发框架。 Mesop 1.3.3之前版本存在资源管理错误漏洞，该漏洞源于调试模式下/hot-reload端点的无界循环取决于用户提供的counter参数，可能导致未经身份验证的攻击者占用工作线程，耗尽线程池，导致服务器不可用。

CVSS 8.7 · High EPSS 0.53% · P43

Affected Version Matrix 1

VendorProduct Version RangeStatus
mesop-dev mesop < 1.3.3 affected
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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
Vulnerability Title
Mesop 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mesop是Mesop团队的一个面向Web应用的开发框架。 Mesop 1.3.3之前版本存在资源管理错误漏洞，该漏洞源于调试模式下/hot-reload端点的无界循环取决于用户提供的counter参数，可能导致未经身份验证的攻击者占用工作线程，耗尽线程池，导致服务器不可用。
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
mesop-dev mesop < 1.3.3 -

II. Public POCs for CVE-2026-77357

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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)

IV. Related Vulnerabilities

Same product: mesop
Same vendor: mesop-dev
Same weakness: CWE-400

V. Comments for CVE-2026-77357

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