CVE-2026-5160: Yuin Goldmark

Medium severity, CVSS 6.1. EPSS: 0.3% chance of exploitation in the next 30 days.

Versions of the package github.com/yuin/goldmark/renderer/html before 1.7.17 are vulnerable to Cross-site Scripting (XSS) due to improper ordering of URL validation and normalization. The renderer validates link destinations using a prefix-based check (IsDangerousURL) before resolving HTML entities. This allows an attacker to bypass protocol filtering by encoding dangerous schemes using HTML5 named character references. For example, a payload such as javascript:alert(1) is not recognized as dangerous during validation, leading to arbitrary script execution in the context of applications that render the URL.

Affected products

• Yuin Goldmark: before 1.7.17 (fixed in 1.7.17)

Published 2026-04-15. Last modified 2026-06-17.