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CVE-2026-34824

CVE-2026-34824 · Mesop: Unbounded Thread Creation in WebSocket Handler Leads to Denial of Service

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Mesop is a Python-based UI framework that allows users to build web applications. From version 1.2.3 to before version 1.2.5, an uncontrolled resource consumption vulnerability exists in the WebSocket implementation of the Mesop framework. An unauthenticated attacker can send a rapid succession of WebSocket messages, forcing the server to spawn an unbounded number of operating system threads. This leads to thread exhaustion and Out of Memory (OOM) errors, causing a complete Denial of Service (DoS) for any application built on the framework. This issue has been patched in version 1.2.5.

CVSS 7.5 · High · EPSS 0.7% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • mesop

    Versions
    • >= 1.2.3, < 1.2.5: Affected

    No fix published

  • mesop PyPI

    Versions
    • 1.2.3
    • 1.2.4rc1
    • 1.2.5rc1
    Affected ranges
    • ECOSYSTEM: ≥ 1.2.3, < 1.2.5

    Update to 1.2.5

Original sources

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