CVE-2026-41148

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Source
https://cve.org/CVERecord?id=CVE-2026-41148
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-41148.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-41148
Aliases
Downstream
Related
Published
2026-05-22T22:03:50.872Z
Modified
2026-05-28T03:55:25.129712517Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:L/SI:L/SA:L CVSS Calculator
Summary
Mermaid: Improper sanitization of `classDefs` in diagrams leads to CSS injection
Details

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 <iframe>.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41148.json",
    "cwe_ids": [
        "CWE-94"
    ],
    "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
0 Unknown introduced commit / All previous commits are affected
Fixed
dd351a7cef45b70638147a5e000f1ee8bfd35637

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
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

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-41148.json"