Skip to content
fr Sign in
7.5 High

CVE-2026-59922 Mistune is a Python Markdown parser with renderers and plugins

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a run of closed tilde, equals-sign, or caret marker pairs around a character causes quadratic work in src/mistune/plugins/formatting.py when the strikethrough, mark, or insert plugin scans for matching markers from each possible start position, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.

Affected products and versions

Product Affected versions Fixed in
mistune 3.3 earliest → < 3.3.0 3.3.0

References

Timeline

  1. Published
  2. Last modified

Other CVEs of mistune

The 28 CVEs of mistune →
CVE-2026-121437 Mistune from 3.3.0 before 3.3.4 contains a denial of service vulnerability that allows remote attackers to exhaust CPU… 8.7 High CVE-2026-121438 Mistune before 3.3.3 contains a denial of service vulnerability in InlineParser.parse_link that allows attackers to… 6.9 Medium CVE-2026-115354 Mistune before 3.3.0 contains a path traversal vulnerability in the opt-in Include directive that allows attackers to… 7.1 High CVE-2026-115355 Mistune before 3.3.0 contains a path traversal vulnerability in the Include directive that allows attackers to read… 8.7 High
Track this CVE