Vulnerability details
CVE-2026-34824
mesop-dev mesop
Mesop: Unbounded Thread Creation in WebSocket Handler Leads to Denial of Service
CVSS 3.1
7.5High
Official 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 scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.5High | 3.1 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| mesop-dev | mesop | >= 1.2.3, < 1.2.5 | CVEProject cvelistV5 (CNA) |
References and advisories
3- https://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987 x_refsource_MISC
- https://github.com/mesop-dev/mesop/releases/tag/v1.2.5 x_refsource_MISC
- https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679 x_refsource_CONFIRM
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Details
- Published
- 2026-04-04
- Last updated
- 2026-04-06
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.75%
Probability of exploitation in 30 days
55.2%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- Proof of concept
- Technical impact
- Partial
Weaknesses (CWE)
- CWE-125Out-of-bounds Read