Nixpkgs security tracker
6.1 MEDIUM
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): Required (R)
- Scope (S): Changed (C)
- Confidentiality (C): Low (L)
- Integrity (I): Low (L)
- Availability (A): None (N)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): Required (R)
- Modified Confidentiality (MC): Low (L)
- Modified Scope (MS): Changed (C)
- Modified Integrity (MI): Low (L)
- Modified Availability (MA): None (N)
by @ADMIN Activity log
- Created suggestion
- @ADMIN dismissed (already tracked in derivation metadata)
Mistune TOC Anchor Injection XSS
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, render_toc_ul() 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
-
https://github.com/lepture/mistune/security/advisories/GHSA-6269-cqxg-mhhv x_refsource_CONFIRM
-
https://github.com/lepture/mistune/releases/tag/v3.2.1 x_refsource_MISC
Affected products
- ==< 3.2.1
Matching in nixpkgs
pkgs.python313Packages.mistune_2
Sane Markdown parser with useful plugins and renderers
pkgs.python314Packages.mistune_2
Sane Markdown parser with useful plugins and renderers