CVEvulnerability

CVE-2026-59929

6.1 MEDIUM Published 2026-07-08 Modified 2026-10-25 Official page ↗

Status: Analyzed
Published: 2026-07-08
Last modified: 2026-10-25
Assigner: [email protected]
CVSS 3.1 ([email protected]): 6.1 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weaknesses: CWE-184, CWE-79

Description

Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. This issue is fixed in version 3.3.0.

Affected configurations

• mistune project mistune (< 3.3.0)

Weakness · CWE (2)

CWE-184 Incomplete List of Disallowed Inputs weakness
CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References

https://github.com/lepture/mistune/commit/c7101fcbb6e8790e8e39157c5ca2238fc6dd6cbc Patch
https://github.com/lepture/mistune/releases/tag/v3.3.0 Release Notes
https://github.com/lepture/mistune/security/advisories/GHSA-qfrw-5rxm-mhh2 Exploit, Third Party Advisory

CVE-2026-59929

Description

Affected configurations

Related

Weakness · CWE (2)

References