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Vulnerability record · CVE-2026-34824 · published 3 April 2026

CVE-2026-34824: Mesop-dev mesop out-of-bounds read vulnerability

MMesop Dev · Mesop

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.

7.5 CVSS 3.1 High EPSS 0.67% · top 49.9% CWE-125 · Out-of-bounds readCWE-770 · Allocation without limits
7.5CVSS 3.1 base score
0.67%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References, 2 tagged exploit
24 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987 Patch
https://github.com/mesop-dev/mesop/releases/tag/v1.2.5 ProductRelease Notes
https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 ExploitMitigationVendor Advisory
https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 ExploitMitigationVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-34824), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.