{"id":"GHSA-jr9p-r423-9m2r","summary":"markdown2 Regular Expression Denial of Service ","details":"markdown2 \u003e=1.0.1.18, fixed in 2.4.0, is affected by a regular expression denial of service vulnerability. If an attacker provides a malicious string, it can make markdown2 processing difficult or delayed for an extended period of time.","aliases":["CVE-2021-26813","PYSEC-2021-20"],"modified":"2025-02-21T05:30:49.729149Z","published":"2021-06-02T21:44:28Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2021-05-12T21:02:47Z","nvd_published_at":"2021-03-03T16:15:00Z","cwe_ids":["CWE-1333"]},"references":[{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-26813"},{"type":"WEB","url":"https://github.com/trentm/python-markdown2/pull/387"},{"type":"WEB","url":"https://github.com/trentm/python-markdown2/commit/7b651260739647de5198323e0445b1618750c374"},{"type":"ADVISORY","url":"https://github.com/advisories/GHSA-jr9p-r423-9m2r"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/markdown2/PYSEC-2021-20.yaml"},{"type":"PACKAGE","url":"https://github.com/trentm/python-markdown2"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BRP5RN35JZTSJ3JT4722F447ZDK7LZS5"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/J752422YELXLMLZJPVJVKD2KKHHQRVEH"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JTIX5UXRDJZJ57DO4V33ZNJTNKWGBQLY"}],"affected":[{"package":{"name":"markdown2","ecosystem":"PyPI","purl":"pkg:pypi/markdown2"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.0.1.18"},{"fixed":"2.4.0"}]}],"versions":["1.0.1.18","1.0.1.19","1.1.0","1.1.1","1.2.0","1.3.0","1.3.1","1.4.0","1.4.1","1.4.2","2.0.0","2.0.1","2.1.0","2.2.0","2.2.1","2.2.2","2.2.3","2.3.0","2.3.1","2.3.10","2.3.2","2.3.3","2.3.4","2.3.5","2.3.6","2.3.7","2.3.8","2.3.9"],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2021/06/GHSA-jr9p-r423-9m2r/GHSA-jr9p-r423-9m2r.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}