{"id":"AZL-88403","summary":"CVE-2026-44898 affecting package python-mistune for versions less than 3.2.1-1","details":"Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() builds a \u003cul\u003e table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href=\"#\u003cid\u003e\") and the text value (used as the visible link label) are inserted into \u003ca\u003e tags via a plain Python format string — with no HTML escaping applied to either value. When heading IDs are derived from user-supplied heading text (the standard use-case for readable slug anchors), an attacker can craft a heading whose text breaks out of the href=\"#...\" attribute context, injecting arbitrary HTML tags including \u003cscript\u003e blocks directly into the rendered TOC. This vulnerability is fixed in 3.2.1.","modified":"2026-08-28T17:47:37.578907591Z","published":"2026-05-26T21:16:39Z","upstream":["CVE-2026-44898"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44898"}],"affected":[{"package":{"name":"python-mistune","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/python-mistune"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-88403.json"}}],"schema_version":"1.9.0"}