{"id":"CVE-2026-44896","summary":"Mistune: XSS via unescaped figclass/figwidth in Figure directive","details":"Mistune is a Python Markdown parser with renderers and plugins. In 3.2.0 and earlier, in src/mistune/directives/image.py, the render_figure() function concatenates figclass and figwidth options directly into HTML attributes without escaping. This allows attribute injection and XSS even when HTMLRenderer(escape=True) is used, because these values bypass the inline renderer. Version 3.2.1 contains a patch.","aliases":["GHSA-58cw-g322-p94v","PYSEC-2026-168"],"modified":"2026-07-17T18:29:34.995863691Z","published":"2026-05-26T20:33:38.696Z","related":["CGA-px49-gmh5-fgv6","SUSE-SU-2026:21858-1","SUSE-SU-2026:22655-1","openSUSE-SU-2026:20827-1","openSUSE-SU-2026:21339-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44896.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-79"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44896.json"},{"type":"ADVISORY","url":"https://github.com/lepture/mistune/security/advisories/GHSA-58cw-g322-p94v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44896"},{"type":"FIX","url":"https://github.com/lepture/mistune/commit/a3cb6e5655308797e8be021d6c7b5bab13cbace2"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/lepture/mistune","events":[{"introduced":"0"},{"fixed":"a3cb6e5655308797e8be021d6c7b5bab13cbace2"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"last_affected":"3.2.0"}],"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*"}}],"versions":["v3.2.0","v3.1.4","v3.1.3","v3.1.2","v3.1.1","v3.1.0","v3.0.1","v3.0.0","v3.0.0rc5","v3.0.0rc4","v3.0.0rc3","v3.0.0rc2","v3.0.0rc1","v3.0.0a3","v3.0.0a2","v3.0.0a1","v2.0.2","v2.0.1","v2.0.0","v2.0.0rc1","v2.0.0a6","v2.0.0a5","v2.0.0a4","v2.0.0a3","v2.0.0a2","v2.0.0a1","v0.8.4","v0.8.3","v0.8.2","v0.8.1","v0.8","v0.7.4","v0.7.3","v0.7.2","v0.7.1","v0.7","v0.6","v0.5.1","v0.5","v0.4.1","v0.4","v0.3.1","v0.3.0","v0.2.0","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44896.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}