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CVE-2026-44897
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 Heading ID Attribute Injection XSS
Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.2.1, HTMLRenderer.heading() builds the opening <hN> tag by string-concatenating the id attribute value directly into the HTML — with no call to escape(), safe_entity(), or any other sanitisation function. A double-quote character " in the id value terminates the attribute, allowing an attacker to inject arbitrary additional attributes (event handlers, src=, href=, etc.) into the heading element. This vulnerability is fixed in 3.2.1.
References
-
https://github.com/lepture/mistune/security/advisories/GHSA-v87v-83h2-53w7 x_refsource_CONFIRM
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https://github.com/lepture/mistune/releases/tag/v3.2.1 x_refsource_MISC
Affected products
mistune
- ==< 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