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CVE-2026-59928

7.5 high SSVC exploitation: poc Analyzed
NVD · CVE.org

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, a Markdown document containing many repeated or distinct reference-link definitions causes quadratic work in src/mistune/block_parser.py and the ref_links environment dictionary handling, allowing denial of service through CPU exhaustion. This issue is fixed in version 3.3.0.

Fix

Patch, vendor advisory and mitigation references on NVD 1

Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.

Change history 1

  1. First seenCVSS 7.5 · mistune_projectNVD modified 2026-10-25 17:10

Affected (CPE criteria) 1

  • cpe:2.3:a:mistune_project:mistune:*:*:*:*:*:*:*:*

References 4