{"action":"Upgrade mistune to 3.2.1 or later.","affected":[{"fixed":"3.2.1","introduced":"0"}],"component":"mistune","cve_ids":["CVE-2026-44899"],"ecosystem":"PyPI","epss":0.00228,"exploited":false,"fixed_versions":["3.2.1"],"ghsa_id":"GHSA-ccfx-mfmx-2fx9","id":"tcs_01M5KGY3B1T725HWM9C5G484WB","modified_at":"2026-07-13T07:15:29.089597285Z","published_at":"2026-05-26T21:16:39.953Z","references":["https://osv.dev/vulnerability/PYSEC-2026-2209","https://github.com/lepture/mistune/releases/tag/v3.2.1","https://github.com/lepture/mistune/security/advisories/GHSA-ccfx-mfmx-2fx9"],"severity":{"label":"medium","score":6.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-2209","url":"https://osv.dev/vulnerability/PYSEC-2026-2209"}],"summary":"Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, the Image directive plugin validates the :width: and :height: options with a regex compiled as _num_re = re.compile(r\"^\\"}