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CVE-2026-59928

PoC —
CVSS 3.1
7.5 high
EPSS
<1%p49
Published
()
Modified
Description

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.

Vendors
mistune project
Products
mistune
Weakness
CWE-407, CWE-1333
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD CVE.org GitHub PoCs EPSS (0.7%)

In the news

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