AZL-88403
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-88403.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-88403
- Upstream
- Published
- 2026-05-26T21:16:39Z
- Modified
- 2026-08-28T17:47:37.578907591Z
- 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, rendertocul() builds a <ul> table-of-contents tree from a list of (level, id, text) tuples. Both the id value (used as href="#<id>") and the text value (used as the visible link label) are inserted into <a> 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 <script> blocks directly into the rendered TOC. This vulnerability is fixed in 3.2.1.
- References