{"cve":"CVE-2026-34824","nvd":{"published":"2026-04-03T23:17:05.213","modified":"2026-07-24T22:10:00.140","status":"Analyzed","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_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-770","CWE-125"],"references":["https://github.com/mesop-dev/mesop/commit/760a2079b5c609038c826d24dfbcf9b0be98d987","https://github.com/mesop-dev/mesop/releases/tag/v1.2.5","https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679","https://github.com/mesop-dev/mesop/security/advisories/GHSA-3jr7-6hqp-x679"],"products":["mesop-dev:mesop"],"source":"nvd","synced_at":"2026-10-19T22:28:59.047572785+00:00"},"epss":{"cve":"CVE-2026-34824","score":0.0075,"percentile":0.5496,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-3jr7-6hqp-x679","url":"https://osv.dev/vulnerability/GHSA-3jr7-6hqp-x679","summary":"Mesop: Unbounded Thread Creation in WebSocket Handler Leads to Denial of Service","modified":"2026-07-13T07:26:47.816851484Z","packages":[{"ecosystem":"PyPI","name":"mesop","purl":"pkg:pypi/mesop","ranges":[">=1.2.3 <1.2.5"],"fixed":["1.2.5"]}]},{"id":"PYSEC-2026-2204","url":"https://osv.dev/vulnerability/PYSEC-2026-2204","summary":"","modified":"2026-07-13T07:15:28.797012959Z","packages":[{"ecosystem":"PyPI","name":"mesop","purl":"pkg:pypi/mesop","ranges":[">=1.2.3 <1.2.5"],"fixed":["1.2.5"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}