CVE-2017-16876: Fedoraproject Fedora

Medium severity, CVSS 6.1. EPSS: 2.2% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in the _keyify function in mistune.py in Mistune before 0.8.1 allows remote attackers to inject arbitrary web script or HTML by leveraging failure to escape the "key" argument.

Affected products

• Fedoraproject Fedora: version 26 only
• Mistune Project Mistune: before 0.8.1 (fixed in 0.8.1)

Published 2017-12-29. Last modified 2026-06-17.