{"id":"CVE-2023-26303","aliases":["GHSA-vrjv-mxr7-vjf8","PYSEC-2023-24"],"url":"https://o3.security/vulnerability/CVE-2023-26303","summary":"markdown-it-py crash on null assertions","details":"Denial of service could be caused to markdown-it-py, before v2.2.0, if an attacker was allowed to force null assertions with specially crafted input.","published":"2023-02-22T23:44:40.711Z","modified":"2026-08-12T03:51:33.396983238Z","cvss":{"score":3.3,"severity":"LOW","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"PyPI","name":"markdown-it-py","fixedVersion":"2.2.0"}],"fix":{"url":"https://github.com/executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49","label":"executablebooks/markdown-it-py@ae03c61"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/26xxx/CVE-2023-26303.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-26303"},{"type":"FIX","url":"https://github.com/executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49"},{"type":"PACKAGE","url":"https://github.com/executablebooks/markdown-it-py"},{"type":"PACKAGE","url":"https://github.com/executablebooks/markdown-it-py/releases"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:33.396983238Z"}}