CVE-2026-59930

MEDIUM
MEDIUM Priority: 0.01 BB Relevance: 59/100
Published: 2026-07-08 Modified: 2026-10-25 First seen: 2026-10-29 Status: active

Attack Surface

Network Low Complexity No Auth

CVSS Vector Breakdown

AV: Network
AC: Low
PR: None
UI: Required
S: Unchanged
C: None
I: Low
A: None

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the toc plugin and TableOfContents directive generate heading IDs as predictable toc_N values without slugifying the heading text, allowing attacker-controlled id="toc_N" content to collide with generated anchors and redirect same-page navigation, CSS selectors, or JavaScript handlers. This issue is fixed in version 3.3.0.

Weakness Classification (2)

Affected Software (1)

VendorProductVersion
mistune_project mistune < 3.3.0

Bug Bounty Relevance

59 / 100
✓ Network accessible
✓ No authentication
✓ Low complexity

CVSS Score

4.3 / 10.0 v3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

EPSS — Exploitation Probability

0.19%
Raw Score 0.001920
Percentile 8.8%
Date 2026-10-29

EPSS Trend

2026-10-29
0.00192
2026-10-28
0.00192

Intelligence Sources

nvd ref →