{"cve":"CVE-2021-32838","nvd":{"published":"2021-09-20T18:15:11.010","modified":"2026-06-17T03:53:44.003","status":"Modified","description":"Flask-RESTX (pypi package flask-restx) is a community driven fork of Flask-RESTPlus. Flask-RESTX before version 0.5.1 is vulnerable to ReDoS (Regular Expression Denial of Service) in email_regex. This is fixed in version 0.5.1.","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-400"],"references":["https://github.com/advisories/GHSA-3q6g-vf58-7m4g","https://github.com/python-restx/flask-restx/blob/fd99fe11a88531f5f3441a278f7020589f9d2cc0/flask_restx/inputs.py#L51","https://github.com/python-restx/flask-restx/commit/bab31e085f355dd73858fd3715f7ed71849656da","https://github.com/python-restx/flask-restx/issues/372","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5UCTFVDU3677B5OBGK4EF5NMUPJLL6SQ/"],"products":["fedoraproject:fedora","flask-restx_project:flask-restx"],"source":"nvd","synced_at":"2026-10-19T21:23:41.316049955+00:00"},"epss":{"cve":"CVE-2021-32838","score":0.01864,"percentile":0.79274,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-3q6g-vf58-7m4g","url":"https://osv.dev/vulnerability/GHSA-3q6g-vf58-7m4g","summary":"Regular Expression Denial of Service in flask-restx","modified":"2026-07-08T06:28:20.629860342Z","packages":[{"ecosystem":"PyPI","name":"flask-restx","purl":"pkg:pypi/flask-restx","ranges":["<0.5.1"],"fixed":["0.5.1"]}]},{"id":"PYSEC-2021-325","url":"https://osv.dev/vulnerability/PYSEC-2021-325","summary":"","modified":"2023-11-08T04:06:01.923801Z","packages":[{"ecosystem":"PyPI","name":"flask-restx","purl":"pkg:pypi/flask-restx","ranges":["<0.5.1"],"fixed":["0.5.1"]}]}],"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."]}