CVE•Published 2026-07-08•Modified 2026-07-09•0 articles on news•5 live references•NVD data

CVE-2026-59929Mistune_project · Mistune

Vulnerability data via NVD (ingested)

CVSS v3.1

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS percentile

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Weaknesses (CWE)

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')CWE-184Incomplete List of Disallowed Inputs

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.

Timeline

Published 2026-07-08

Modified 2026-07-09

External references

NVD MITRE Exploit-DB trickest/cve VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-59929

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Mistune Project Mistune"

All exposed Mistune Project Mistune instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Mistune"

HTTP body or banner mentions "Mistune" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-59929