CVE-2026-41149

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>.

Database specific

{
    "cwe_ids": [
        "CWE-94"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41149.json",
    "cna_assigner": "GitHub_M"
}

References

Affected packages

Git / github.com/mermaid-js/mermaid

Affected ranges

Type

GIT

Repo

https://github.com/mermaid-js/mermaid

Events

Introduced

Fixed

41646dfd43ac83f001b03c70605feb036afae46d

Fixed

dd351a7cef45b70638147a5e000f1ee8bfd35637

Database specific

{
    "extracted_events": [
        {
            "introduced": "11.0.0-alpha.1"
        },
        {
            "fixed": "11.15.0"
        },
        {
            "introduced": "0"
        },
        {
            "fixed": "10.9.6"
        }
    ],
    "source": "AFFECTED_FIELD"
}

Affected versions

0.*

0.1.0

0.1.1

0.2.0

0.2.1

0.2.13

0.2.14

0.2.15

0.2.16

0.2.2

0.2.3

0.2.4

0.2.5

0.2.6

0.2.7

0.2.8

0.3.0

0.3.1

0.3.2

0.3.3

0.3.4

0.3.5

0.4.0

0.5.0

0.5.1

0.5.2

0.5.3

0.5.4

0.5.5

0.5.6

0.5.7

6.*

6.0.0

7.*

7.0.0

7.0.2

7.0.3

7.0.5

8.*

8.1.0

8.11.0-rc2

8.11.3

8.11.4

8.12.1

8.13.10

8.13.11

8.13.5

8.13.6

8.13.7

8.2.0

8.2.1

8.2.2

8.2.3

8.2.4

8.2.5

8.2.6

8.3.0

8.4.4

8.4.6

8.4.8

8.5.1

8.5.2

8.6.0

8.6.2

8.7.0

8.8.0

8.8.3

8.9.1

8.9.3

9.*

9.1.2

9.1.3

9.1.5

@mermaid-js/examples@1.*

@mermaid-js/examples@1.1.0

@mermaid-js/examples@1.2.0

@mermaid-js/layout-elk@0.*

@mermaid-js/layout-elk@0.1.1

@mermaid-js/layout-elk@0.1.2

@mermaid-js/layout-elk@0.1.3

@mermaid-js/layout-elk@0.1.4

@mermaid-js/layout-elk@0.1.5

@mermaid-js/layout-elk@0.1.6

@mermaid-js/layout-elk@0.1.7

@mermaid-js/layout-elk@0.1.8

@mermaid-js/layout-elk@0.1.9

@mermaid-js/layout-elk@0.2.0

@mermaid-js/layout-elk@0.2.1

@mermaid-js/layout-tidy-tree@0.*

@mermaid-js/layout-tidy-tree@0.2.0

@mermaid-js/layout-tidy-tree@0.2.1

@mermaid-js/layout-tidy-tree@0.2.2

@mermaid-js/mermaid-zenuml@0.*

@mermaid-js/mermaid-zenuml@0.2.1

@mermaid-js/mermaid-zenuml@0.2.2

@mermaid-js/parser@0.*

@mermaid-js/parser@0.2.0

@mermaid-js/parser@0.3.0

@mermaid-js/parser@0.4.0

@mermaid-js/parser@0.5.0

@mermaid-js/parser@0.6.0

@mermaid-js/parser@0.6.1

@mermaid-js/parser@0.6.3

@mermaid-js/parser@1.*

@mermaid-js/parser@1.0.0

@mermaid-js/parser@1.0.1

@mermaid-js/parser@1.1.0

@mermaid-js/parser@1.1.1

@mermaid-js/tiny@11.*

@mermaid-js/tiny@11.10.0

@mermaid-js/tiny@11.10.1

@mermaid-js/tiny@11.11.0

@mermaid-js/tiny@11.12.0

@mermaid-js/tiny@11.12.1

@mermaid-js/tiny@11.12.3

@mermaid-js/tiny@11.13.0

@mermaid-js/tiny@11.14.0

@mermaid-js/tiny@11.7.0

@mermaid-js/tiny@11.8.0

@mermaid-js/tiny@11.8.1

mermaid@11.*

mermaid@11.0.1

mermaid@11.0.2

mermaid@11.1.0

mermaid@11.1.1

mermaid@11.10.0

mermaid@11.10.1

mermaid@11.11.0

mermaid@11.12.0

mermaid@11.12.1

mermaid@11.12.2

mermaid@11.12.3

mermaid@11.13.0

mermaid@11.14.0

mermaid@11.2.0

mermaid@11.2.1

mermaid@11.3.0

mermaid@11.4.0

mermaid@11.4.1

mermaid@11.5.0

mermaid@11.6.0

mermaid@11.7.0

mermaid@11.8.0

mermaid@11.8.1

Other

untagged-31c93788afe260d914bb

untagged-566ebfbf21141b604025

untagged-7651dabb407ecd5631ce

untagged-f43366252632a1a42020

v10.*

v10.1.0

v10.3.0

v10.4.0

v10.7.0

v10.9.0

v10.9.1

v10.9.2

v10.9.3

v10.9.4

v10.9.5

v11.*

v11.0.0

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41149.json"