{"id":"CVE-2021-40978","aliases":["GHSA-qh9q-34h6-hcv9","PYSEC-2021-878"],"url":"https://o3.security/vulnerability/CVE-2021-40978","summary":"Directory traversal in mkdocs","details":"The mkdocs 1.2.2 built-in dev-server allows directory traversal using the port 8000, enabling remote exploitation to obtain :sensitive information. NOTE: the vendor has disputed this as described in https://github.com/mkdocs/mkdocs/issues/2601.] and https://github.com/nisdn/CVE-2021-40978/issues/1","published":"2021-10-07T14:15:08.280Z","modified":"2026-07-08T23:57:51.083105Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},"epss":null,"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"PyPI","name":"mkdocs","fixedVersion":"1.2.3"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/mkdocs/mkdocs"},{"type":"REPORT","url":"https://github.com/mkdocs/mkdocs/issues/2601"},{"type":"REPORT","url":"https://github.com/nisdn/CVE-2021-40978/issues/1"},{"type":"EVIDENCE","url":"https://github.com/nisdn/CVE-2021-40978"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-08T23:57:51.083105Z"}}