CVE-2026-34824
Mesop: Unbounded Thread Creation in WebSocket Handler Leads to Denial of Service
Description
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.
INFO
Published Date :
April 3, 2026, 11:17 p.m.
Last Modified :
April 13, 2026, 5:28 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update Mesop to version 1.2.5.
- Apply security patches for Mesop.
- Monitor server resource usage.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-34824.
| URL | Resource |
|---|---|
| https://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987 | Patch |
| https://github.com/mesop-dev/mesop/releases/tag/v1.2.5 | Product Release Notes |
| https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 | Exploit Mitigation Vendor Advisory |
| https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 | Exploit Mitigation Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-34824 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-34824
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-34824 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-34824 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 13, 2026
Action Type Old Value New Value Added CWE CWE-770 Added CPE Configuration OR *cpe:2.3:a:mesop-dev:mesop:*:*:*:*:*:python:*:* versions from (including) 1.2.3 up to (excluding) 1.2.5 Added Reference Type GitHub, Inc.: https://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/mesop-dev/mesop/releases/tag/v1.2.5 Types: Product, Release Notes Added Reference Type GitHub, Inc.: https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 Types: Exploit, Mitigation, Vendor Advisory Added Reference Type CISA-ADP: https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 Types: Exploit, Mitigation, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 06, 2026
Action Type Old Value New Value Added Reference https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 -
New CVE Received by [email protected]
Apr. 03, 2026
Action Type Old Value New Value Added Description 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-125 Added Reference https://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987 Added Reference https://github.com/mesop-dev/mesop/releases/tag/v1.2.5 Added Reference https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679