CVE-2026-5160: 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.
Overview
- Severity
- Medium (CVSS 6.1)
- CVSS Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Exploit Status
- Not Exploited
- Patch Tuesday
- 2026-Apr
- Released
- 2026-04-19
- Last Updated
- 2026-04-29
- EPSS Score
- 0.05% (percentile: 15.9%)
Affected Products (6)
Open Source Software
- cbl2 gh 2.13.0-26 on CBL Mariner 2.0
- azl3 telegraf 1.31.0-17 on Azure Linux 3.0
- azl3 gh 2.62.0-15 on Azure Linux 3.0
- azl3 telegraf 1.31.0-19 on Azure Linux 3.0
- azl3 gh 2.62.0-13 on Azure Linux 3.0
- cbl2 telegraf 1.29.4-22 on CBL Mariner 2.0
Revision History
- 2026-04-19: Information published.
- 2026-04-20: Information published.
- 2026-04-22: Information published.
- 2026-04-23: Information published.
- 2026-04-29: Information published.