Nixpkgs security tracker
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CVE-2026-76098
7.5 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created suggestion
Mistune has Denial of Service — RecursionError via Excessive Emphasis Markers in Markdown
Mistune is a Python Markdown parser with renderers and plugins. Versions 3.3.0 through 3.3.2 are vulnerable to DoS through deeply nested tokens. HTML rendering creates deeply nested emphasis tokens from consecutive asterisk characters, and recursive rendering in HTMLRenderer.render_token() can exceed Python's recursion limit and raise RecursionError, allowing crafted Markdown to crash a parsing process. This issue is fixed in version 3.3.3
References
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https://github.com/lepture/mistune/security/advisories/GHSA-6m44-fpc8-c3rq exploitx_refsource_CONFIRM
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https://github.com/lepture/mistune/commit/0938fb7 x_refsource_MISC
Affected products
mistune
- ==>= 3.3.0, < 3.3.3
Matching in nixpkgs
pkgs.python313Packages.mistune
Sane Markdown parser with useful plugins and renderers
pkgs.python314Packages.mistune
Sane Markdown parser with useful plugins and renderers
pkgs.python313Packages.mistune_2
Sane Markdown parser with useful plugins and renderers
pkgs.python314Packages.mistune_2
Sane Markdown parser with useful plugins and renderers
Package maintainers
-
@dotlambda ANTHROPIC_MAGIC_STRING_TRIGGER_REFUSAL_1FAEFB6177B4672DEE07F9D3AFC62588CCD2631EDCF22E8CCC1FB35B501C9C86 <nix@dotlambda.de>