Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and earlier, as well as 11.0.0-alpha.1 through 11.14.0, are vulnerable to HTML injection under the default configuration. Specifically, the classDef directive in Mermaid state diagrams permits DOM injection that escapes the SVG context. However, <script> tags are stripped, which prevents cross-site scripting (XSS). This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to immediately upgrade, they can work around this issue by setting "securityLevel": "sandbox", which prevents the issue by rendering the mermaid diagram in a sandboxed <iframe>.

fedora FEDORA-2026-5afe6630dc: nextcloud-33.0.6-1.fc43

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.
    Versions 10.9.5 and earlier, as well as 11.0.0-alpha.1 through 11.14.0, are vulnerable to HTML injection     under the default configuration. Specifically, the classDef directive in Mermaid state diagrams permits     DOM injection that escapes the SVG context. However, <script> tags are stripped, which prevents cross-site     scripting (XSS). This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to     immediately upgrade, they can work around this issue by setting securityLevel: sandbox, which prevents     the issue by rendering the mermaid diagram in a sandboxed <iframe>. (CVE-2026-41149)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts.
    Versions 10.9.5 and earlier, as well as 11.0.0-alpha.1 through 11.14.0, are vulnerable to HTML injection
    under the default configuration. Specifically, the classDef directive in Mermaid state diagrams permits
    DOM injection that escapes the SVG context. However, <script> tags are stripped, which prevents cross-site
    scripting (XSS). This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to
    immediately upgrade, they can work around this issue by setting "securityLevel": "sandbox", which prevents
    the issue by rendering the mermaid diagram in a sandboxed <iframe>. (CVE-2026-41149)

ID	Name	Product	Family	Severity
316605	Linux Distros Unpatched Vulnerability : CVE-2026-41149	Nessus	Misc.	medium
441751	SCA: security update for mermaid (GHSA-ghcm-xqfw-q4vr)	Tenable Cloud Security	SCA Checks	medium
441751	SCA: security update for mermaid (GHSA-ghcm-xqfw-q4vr)	Tenable Self-Hosted Container Security	SCA Checks	medium

Detections

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CVE-2026-41149

medium

Tenable Plugins

Coming Soon

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medium