{"cve":"CVE-2023-26303","nvd":{"published":"2023-02-23T00:15:11.390","modified":"2026-06-17T05:43:01.760","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-173"],"references":["https://github.com/executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49","https://github.com/executablebooks/markdown-it-py/commit/ae03c6107dfa18e648f6fdd1280f5b89092d5d49"],"products":["executablebooks:markdown-it-py"],"source":"nvd","synced_at":"2026-10-19T21:37:41.955480748+00:00"},"epss":{"cve":"CVE-2023-26303","score":0.00227,"percentile":0.13471,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-vrjv-mxr7-vjf8","url":"https://osv.dev/vulnerability/GHSA-vrjv-mxr7-vjf8","summary":"markdown-it-py Denial of Service vulnerability","modified":"2024-09-30T20:36:38.036289Z","packages":[{"ecosystem":"PyPI","name":"markdown-it-py","purl":"pkg:pypi/markdown-it-py","ranges":["<2.2.0"],"fixed":["2.2.0"]}]},{"id":"PYSEC-2023-24","url":"https://osv.dev/vulnerability/PYSEC-2023-24","summary":"","modified":"2026-06-10T17:02:03.248247640Z","packages":[{"ecosystem":"PyPI","name":"markdown-it-py","purl":"pkg:pypi/markdown-it-py","ranges":["<2.2.0"],"fixed":["2.2.0"]}]}],"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."]}