{"cve":"CVE-2025-30358","nvd":{"published":"2025-03-27T15:16:02.297","modified":"2026-06-17T09:08:34.693","status":"Deferred","description":"Mesop is a Python-based UI framework that allows users to build web applications. A class pollution vulnerability in Mesop prior to version 0.14.1 allows attackers to overwrite global variables and class attributes in certain Mesop modules during runtime. This vulnerability could directly lead to a denial of service (DoS) attack against the server. Additionally, it could also result in other severe consequences given the application's implementation, such as identity confusion, where an attacker could impersonate an assistant or system role within conversations. This impersonation could potentially enable jailbreak attacks when interacting with large language models (LLMs). Just like the Javascript's prototype pollution, this vulnerability could leave a way for attackers to manipulate the intended data-flow or control-flow of the application at runtime and lead to severe consequences like remote code execution when gadgets are available. Users should upgrade to version 0.14.1 to obtain a fix for the issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H","score":8.1},"cwes":["CWE-915"],"references":["https://github.com/mesop-dev/mesop/commit/748e20d4a363d89b841d62213f5b0c6b4bed788f","https://github.com/mesop-dev/mesop/security/advisories/GHSA-f3mf-hm6v-jfhh"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:00:28.034033815+00:00"},"epss":{"cve":"CVE-2025-30358","score":0.0071,"percentile":0.53547,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-f3mf-hm6v-jfhh","url":"https://osv.dev/vulnerability/GHSA-f3mf-hm6v-jfhh","summary":"Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks","modified":"2026-07-07T17:56:28.575221057Z","packages":[{"ecosystem":"PyPI","name":"mesop","purl":"pkg:pypi/mesop","ranges":["<0.14.1"],"fixed":["0.14.1"]}]},{"id":"PYSEC-2026-1624","url":"https://osv.dev/vulnerability/PYSEC-2026-1624","summary":"Mesop Class Pollution vulnerability leads to DoS and Jailbreak attacks","modified":"2026-07-07T17:47:04.425106032Z","packages":[{"ecosystem":"PyPI","name":"mesop","purl":"pkg:pypi/mesop","ranges":["<0.14.1"],"fixed":["0.14.1"]}]}],"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."]}