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.
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Affected Vendors & Products
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Fixes
Solution
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Workaround
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References
History
Wed, 15 Apr 2026 05:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | 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. | |
| Weaknesses | CWE-79 | |
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| Metrics |
cvssV3_1
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MITRE
Status: PUBLISHED
Assigner: snyk
Published:
Updated: 2026-04-15T05:00:01.655Z
Reserved: 2026-03-30T14:14:48.647Z
Link: CVE-2026-5160
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses