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DEBIAN-CVE-2026-41148

Type: advisorySource: OSV1 source record

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and prior, in addition to 11.0.0-alpha.1 through 11.12.0 are vulnerable to CSS injection through improper sanitization. The state diagram (and any other diagram type that routes user-controlled style strings through the createCssStyles parser) captures classDef values using an unrestricted regex that matches everything up to a newline. That value then flows unsanitized through addStyleClass() into createCssStyles() and is assigned to style.innerHTML, so a closing brace (}) in the value terminates the generated CSS selector and turns everything after it into a new CSS rule on the page. This enables page defacement, user tracking via url() callbacks, and DOM attribute exfiltration. 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 .

Announced Source revision 1
Original source ↗

DEBIAN-CVE-2026-41148

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:DEBIAN-CVE-2026-41148

node-mermaid

Source reference: /affected/0/package/name

Affected versions
8.11.0+ds+~cs29.13.22-1

Source reference: /affected/0/versions

8.13.2+ds+~cs30.13.21-1

Source reference: /affected/0/versions

8.13.2+ds+~cs30.13.21-1.1

Source reference: /affected/0/versions

8.13.3+ds+~cs26.13.21-1

Source reference: /affected/0/versions

8.13.3+ds+~cs26.13.21-2

Source reference: /affected/0/versions

8.13.8+~cs10.4.16-1

Source reference: /affected/0/versions

8.14.0+ds1+~cs11.4.14-1

Source reference: /affected/0/versions

8.14.0+~cs11.4.14-1

Source reference: /affected/0/versions

8.7.0+ds+~cs27.17.17-1

Source reference: /affected/0/versions

8.7.0+ds+~cs27.17.17-2

Source reference: /affected/0/versions

8.7.0+ds+~cs27.17.17-2~bpo10+1

Source reference: /affected/0/versions

8.7.0+ds+~cs27.17.17-3

Source reference: /affected/0/versions

8.9.1+ds+~cs26.20.25-1

Source reference: /affected/0/versions

8.9.3+ds+~cs29.13.19-1

Source reference: /affected/0/versions

9.2.2+~2.0.0-1

Source reference: /affected/0/versions

9.2.2+~2.0.0-2

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "node-mermaid",
      "purl": "pkg:deb/debian/node-mermaid?arch=source&distro=forky",
      "ecosystem": "Debian:14"
    },
    "versions": [
      "8.11.0+ds+~cs29.13.22-1",
      "8.13.2+ds+~cs30.13.21-1",
      "8.13.2+ds+~cs30.13.21-1.1",
      "8.13.3+ds+~cs26.13.21-1",
      "8.13.3+ds+~cs26.13.21-2",
      "8.13.8+~cs10.4.16-1",
      "8.14.0+ds1+~cs11.4.14-1",
      "8.14.0+~cs11.4.14-1",
      "8.7.0+ds+~cs27.17.17-1",
      "8.7.0+ds+~cs27.17.17-2",
      "8.7.0+ds+~cs27.17.17-2~bpo10+1",
      "8.7.0+ds+~cs27.17.17-3",
      "8.9.1+ds+~cs26.20.25-1",
      "8.9.3+ds+~cs29.13.19-1",
      "9.2.2+~2.0.0-1",
      "9.2.2+~2.0.0-2"
    ],
    "database_specific": {
      "source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-41148.json"
    },
    "ecosystem_specific": {
      "urgency": "not yet assigned"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#57593 · Revision 1
Added to Heist Feed
Publisher date
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