CVE-2026-71437

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Source
https://cve.org/CVERecord?id=CVE-2026-71437
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-71437.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2026-71437
Aliases
Downstream
Published
2026-08-06T19:51:52Z
Modified
2026-08-12T03:30:28Z
Severity
  • 6.5 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:H/SI:H/SA:H CVSS Calculator
Summary
Mermaid Architecture diagrams are vulnerable to prototype pollution
Details

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. From version 11.5.0 until 11.16.1, Mermaid Architecture Diagrams are vulnerable to prototype pollution when a diagram defines a group with an id of proto. Because the group id is used directly as an object property key without validation, an attacker who can supply diagram text can pollute Object.prototype, potentially affecting the behavior of the embedding application. This issue is fixed in version 11.16.1.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1321"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/71xxx/CVE-2026-71437.json"
}
References

Affected packages

Git / github.com/mermaid-js/mermaid

Affected ranges

Type
GIT
Repo
https://github.com/mermaid-js/mermaid
Events
Introduced
41a737f6821df4cdeab75643984912b82c1dff7a
Fixed
99af3fc35ef0a9a9c8c6314521344d67523ddccf
Fixed
7ecca0cd7f1658ef74f4e7e91f925724ef403bbf
Database specific
Show details 
{
    "extracted_events":  [
        {
            "introduced":  "11.5.0"
        },
        {
            "fixed":  "11.16.1"
        }
    ],
    "source":  [
        "AFFECTED_FIELD",
        "REFERENCES"
    ]
}

Affected versions

@mermaid-js/examples@1.*
@mermaid-js/examples@1.1.0
@mermaid-js/examples@1.2.0
@mermaid-js/examples@1.3.0
@mermaid-js/layout-elk@0.*
@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-elk@0.2.2
@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/mermaid-zenuml@0.2.3
@mermaid-js/parser@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/parser@1.2.0
@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@11.16.0
@mermaid-js/tiny@11.7.0
@mermaid-js/tiny@11.8.0
@mermaid-js/tiny@11.8.1
mermaid@11.*
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@11.15.0
mermaid@11.16.0
mermaid@11.5.0
mermaid@11.6.0
mermaid@11.7.0
mermaid@11.8.0
mermaid@11.8.1

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-71437.json"