Out-of-bounds Read in Mesop-Dev Mesop
CVE-2026-34824
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (50.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: -0.000
Affected products
- Mesop-Dev Mesop — versions >= 1.2.3, < 1.2.5
Weakness classification (CWE)
References
- github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 (Exploit, Mitigation, Vendor Advisory)
- github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987 (Patch)
- github.com/mesop-dev/mesop/releases/tag/v1.2.5 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34824?
- CVE-2026-34824 is a high-severity vulnerability in Mesop-Dev Mesop, classified under Out-of-bounds Read. CVSS score: 7.5/10. Published 2026-04-03.
- How severe is CVE-2026-34824?
- High severity. CVSS v3 base score is 7.5 out of 10.