CVE-2026-34824

HighCVSS 7.5

Published: 03/04/2026(UTC)Updated: 24/07/2026(UTC)Translated: 25/07/2026(UTC)NVD NIST

Exploitation Probability (EPSS)

Elevated risk

0.72%

50th percentile - higher than 50% of all known CVEs

Summary

Mesop, a Python-based UI framework, from version 1.2.3 to before version 1.2.5 contains an uncontrolled resource consumption vulnerability in the WebSocket implementation. An unauthenticated attacker can send a rapid succession of WebSocket messages, forcing the server to spawn an unbounded number of OS threads, leading to thread exhaustion and Out of Memory (OOM) errors, causing a complete Denial of Service (DoS).

Risk Assessment

An attacker can remotely crash any application built on the Mesop framework, leading to service disruption and potential data loss.

Recommendation

Upgrade Mesop to version 1.2.5 or later, which includes a fix that limits resource consumption.

Other vulnerabilities in Mesop

CVE-2026-77357High
Mesop prior to version 1.3.3, when running in debug mode, exposes a GET /hot-reload endpoint whose unbounded loop depends on the user-supplied counter parameter. An unauthenticated attacker can send requests with high counter values, exhausting the worker pool and making the server unavailable. The attack requires minimal effort and leaves the server unresponsive until manually restarted.

Original NVD description (English source)

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.