CVSS 3.1
7.5 highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVE-2026-34824
High (7.5) in mesop-dev mesop. EPSS 0.8% chance of exploitation in the next 30 days. Fixed in mesop 1.2.5.
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.
Severity
- EPSS
- 0.8% chance of exploitation in the next 30 days; higher than 54% of CVEs (scores of 2026-10-31)
- CWEs
- CWE-770, CWE-125
- Published
- Modified
- Record from
- the NVD, synced
Affected
- mesop-dev:mesop
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-3jr7-6hqp-x679 | PyPI | mesop | >=1.2.3 <1.2.5 | 1.2.5 |
| PYSEC-2026-2204 | PyPI | mesop | >=1.2.3 <1.2.5 | 1.2.5 |