How severe is CVE-2026-5160?

No CVSS score has been assigned to CVE-2026-5160 yet. Review the advisory details and affected package list to assess your exposure.

Which packages are affected by CVE-2026-5160?

CVE-2026-5160 affects the following packages: github.com/yuin/goldmark/renderer/html (Go). Ecosystems affected: Go.

How do I fix CVE-2026-5160?

Update github.com/yuin/goldmark/renderer/html to 1.7.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-5160 is resolved across your whole dependency graph.

How do I detect CVE-2026-5160 in my Go dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/yuin/goldmark/renderer/html, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-5160 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2026-5160 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-5160 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-5160?

CVE-2026-5160 has an EPSS (Exploit Prediction Scoring System) score of 0.3%, placing it in the 21th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-5160?

CVE-2026-5160 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-5160 published, and has it been updated?

CVE-2026-5160 was published on April 15, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐹 Go

Not in CISA KEV

CVE-2026-5160 — html

Fix: yuin/goldmark@cb46bbc

CVE-2026-5160 is a Cross-site Scripting (XSS) vulnerability in github.com/yuin/goldmark/renderer/html. A fix is available for github.com/yuin/goldmark/renderer/html — see the affected versions and patch details below.

goldmark vulnerable to Cross-site Scripting (XSS)

Also known asGHSA-c97m-vxhj-p7j6GO-2026-5320

Published

Apr 15, 2026

Updated

Oct 28, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Nov 9, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗

0.3%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs21th percentile — riskier than 21% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

Real-World Exposure

1 pkg affected

🐹github.com/yuin/goldmark/renderer/html

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

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.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐹Go	`github.com/yuin/goldmark/renderer/html`	all versions	1.7.17`go get github.com/yuin/goldmark/renderer/html@v1.7.17`

Affected Products

1 product · 1 configurations

Application

goldmarkyuin

< 1.7.17

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/yuin/goldmark/renderer/html, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update github.com/yuin/goldmark/renderer/html to 1.7.17 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-5160 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate

This vulnerability is rated as Moderate as user interaction is required by accessing the maliciously crafted content in order to an attacker perform the exploit. A Cross-site Scripting (XSS) flaw exists in `github.com/yuin/goldmark/renderer/html` due to incorrect ordering of URL validation and HTML entity resolution.…

Workaround published by Red Hat

To mitigate this vulnerability, avoid rendering untrusted content with applications utilizing `github.com/yuin/goldmark/renderer/html`. Ensure that all input processed by the affected component is thoroughly sanitized to prevent the injection of malicious HTML entities or dangerous URL schemes.

Source: Red Hat security advisory for CVE-2026-5160 (CC BY 4.0)

Frequently Asked Questions

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&colon;alert(1) is not recognized as dangerous during validation, leading to arbitrary script execution in the context of applications

O3 Security · Impact-Aware SCA

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