SEPTEMBER 18, 2026
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Case File

CVE-2026-77357

HIGH · CVSS 8.7 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-25 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

Applications using the Mesop Python-based UI framework prior to version 1.3.3 are vulnerable to a denial-of-service attack via the exposed GET /hot-reload endpoint, which can be exploited by unauthenticated attackers to exhaust server worker threads. This results in server unavailability until a manual restart is performed. Organizations utilizing Mesop should prioritize upgrading to version 1.3.3 to mitigate this high-severity vulnerability.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-77357
Severity
HIGH
CVSS
8.7
EPSS
0.30%

Original NVD 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.