FKIE_CVE-2026-34824

Vulnerability from fkie_nvd - Published: 2026-04-03 23:17 - Updated: 2026-04-13 17:28
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987Patch
security-advisories@github.comhttps://github.com/mesop-dev/mesop/releases/tag/v1.2.5Product, Release Notes
security-advisories@github.comhttps://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679Exploit, Mitigation, Vendor Advisory
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679Exploit, Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
mesop-dev mesop *
To clipboard 

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    {
      "nodes": [
        {
          "cpeMatch": [
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  "cveTags": [],
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      "value": "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."
    }
  ],
  "id": "CVE-2026-34824",
  "lastModified": "2026-04-13T17:28:47.427",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "impactScore": 3.6,
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  "published": "2026-04-03T23:17:05.213",
  "references": [
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      "tags": [
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  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
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      "type": "Secondary"
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      "description": [
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          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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