# CVE-2026-5160: golang-github-yuin-goldmark: Versions of the package github.com/yuin/goldmark/renderer/html before 1.7.17 are vulnerable to Cross-site Scripting (...

CVE-2026-5160 is fixed in 12 products on 1 platform, first by DEBIAN-CVE-2026-5160, released April 15, 2026. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2026-5160
- Priority: Urgent
- CVSS: n/a (critical)
- EPSS: 0.0029
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 15, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | caddy Fedora 43 | 2.10.2-9.fc43 | [FEDORA-2026-3DC324BD9A](https://patchblox.com/security/data/fix/linux/fedora-2026-3dc324bd9a.md) | Jun 23, 2026 |
| Linux | caddy-debuginfo Fedora 43 | 2.10.2-9.fc43 | [FEDORA-2026-3DC324BD9A](https://patchblox.com/security/data/fix/linux/fedora-2026-3dc324bd9a.md) | Jun 23, 2026 |
| Linux | caddy-debugsource Fedora 43 | 2.10.2-9.fc43 | [FEDORA-2026-3DC324BD9A](https://patchblox.com/security/data/fix/linux/fedora-2026-3dc324bd9a.md) | Jun 23, 2026 |
| Linux | dnsx Fedora 43 | 1.3.0-1.fc43 | [FEDORA-2026-1C78E384E3](https://patchblox.com/security/data/fix/linux/fedora-2026-1c78e384e3.md) | Jul 17, 2026 |
| Linux | dnsx-debuginfo Fedora 43 | 1.3.0-1.fc43 | [FEDORA-2026-1C78E384E3](https://patchblox.com/security/data/fix/linux/fedora-2026-1c78e384e3.md) | Jul 17, 2026 |
| Linux | dnsx-debugsource Fedora 43 | 1.3.0-1.fc43 | [FEDORA-2026-1C78E384E3](https://patchblox.com/security/data/fix/linux/fedora-2026-1c78e384e3.md) | Jul 17, 2026 |
| Linux | golang-github-yuin-goldmark Debian 14 | 1.8.2-1 | [DEBIAN-CVE-2026-5160](https://patchblox.com/security/data/fix/linux/debian-cve-2026-5160.md) | Apr 15, 2026 |
| Linux | govulncheck-vulndb opensuse-leap 16.0 | 0.0.20260723T184607-160000.1.1 | [OPENSUSE-SU-2026:21483-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21483-1.md) | Jul 30, 2026 |
| Linux | mcphost opensuse-leap 16.0 | 0.34.0-160000.3.1 | [OPENSUSE-SU-2026:21480-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21480-1.md) | Jul 30, 2026 |
| Linux | nuclei Fedora 43 | 3.11.0-1.fc43 | [FEDORA-2026-D36CA2DD19](https://patchblox.com/security/data/fix/linux/fedora-2026-d36ca2dd19.md) | Jul 13, 2026 |
| Linux | nuclei-debuginfo Fedora 43 | 3.11.0-1.fc43 | [FEDORA-2026-D36CA2DD19](https://patchblox.com/security/data/fix/linux/fedora-2026-d36ca2dd19.md) | Jul 13, 2026 |
| Linux | nuclei-debugsource Fedora 43 | 3.11.0-1.fc43 | [FEDORA-2026-D36CA2DD19](https://patchblox.com/security/data/fix/linux/fedora-2026-d36ca2dd19.md) | Jul 13, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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