CVE-2026-33943

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Source
https://cve.org/CVERecord?id=CVE-2026-33943
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33943.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-33943
Aliases
Published
2026-03-27T21:15:19Z
Modified
2026-10-21T02:56:51Z
Severity
  • 8.8 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H CVSS Calculator
Summary
Happy DOM ECMAScriptModuleCompiler: unsanitized export names are interpolated as executable code
Details

Happy DOM is a JavaScript implementation of a web browser without its graphical user interface. In versions 15.10.0 through 20.8.7, a code injection vulnerability in ECMAScriptModuleCompiler allows an attacker to achieve Remote Code Execution (RCE) by injecting arbitrary JavaScript expressions inside export { } declarations in ES module scripts processed by happy-dom. The compiler directly interpolates unsanitized content into generated code as an executable expression, and the quote filter does not strip backticks, allowing template literal-based payloads to bypass sanitization. Version 20.8.8 fixes the issue.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-94"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/33xxx/CVE-2026-33943.json"
}
References

Affected packages

Git / github.com/capricorn86/happy-dom

Affected ranges

Type
GIT
Repo
https://github.com/capricorn86/happy-dom
Events
Introduced
1625d4080339190682bc76bbe79ea26132accfda
Fixed
5437fdf8f13adb9590f9f52616d9f69c3ee8db3c
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "15.10.0"
                },
                {
                    "fixed":  "20.8.8"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "range":  [
                {
                    "fixed":  "5437fdf8f13adb9590f9f52616d9f69c3ee8db3c"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "v20.8.8",
            "range":  [
                {
                    "fixed":  "5437fdf8f13adb9590f9f52616d9f69c3ee8db3c"
                }
            ],
            "source":  "REFERENCES_TAG"
        },
        {
            "cpe":  "cpe:2.3:a:capricorn86:happy_dom:*:*:*:*:*:node.js:*:*",
            "range":  [
                {
                    "introduced":  "15.10.0"
                },
                {
                    "fixed":  "20.8.8"
                }
            ],
            "source":  "CPE_RANGE"
        }
    ]
}

Affected versions

v15.*
v15.10.0
v15.10.1
v15.10.2
v15.10.3
v15.10.4
v15.10.5
v15.10.6
v15.10.7
v15.10.8
v15.11.0
v15.11.1
v15.11.2
v15.11.3
v15.11.4
v15.11.5
v15.11.6
v15.11.7
v16.*
v16.0.0
v16.0.1
v16.1.0
v16.2.0
v16.2.1
v16.2.2
v16.2.3
v16.2.4
v16.2.5
v16.2.6
v16.2.7
v16.2.8
v16.2.9
v16.3.0
v16.4.0
v16.4.1
v16.4.2
v16.4.3
v16.5.0
v16.5.1
v16.5.2
v16.5.3
v16.6.0
v16.7.0
v16.7.1
v16.7.2
v16.7.3
v16.8.0
v16.8.1
v17.*
v17.0.0
v17.0.1
v17.0.2
v17.0.3
v17.0.4
v17.1.0
v17.1.1
v17.1.10
v17.1.11
v17.1.12
v17.1.13
v17.1.2
v17.1.3
v17.1.4
v17.1.5
v17.1.6
v17.1.7
v17.1.8
v17.1.9
v17.2.0
v17.2.1
v17.2.2
v17.2.3
v17.2.4
v17.3.0
v17.3.1
v17.3.2
v17.4.0
v17.4.1
v17.4.2
v17.4.3
v17.4.4
v17.4.5
v17.4.6
v17.4.7
v17.4.8
v17.4.9
v17.5.0
v17.5.1
v17.5.2
v17.5.3
v17.5.4
v17.5.5
v17.5.6
v17.5.7
v17.5.8
v17.5.9
v17.6.0
v17.6.1
v17.6.2
v17.6.3
v18.*
v18.0.0
v18.0.1
v19.*
v19.0.0
v19.0.1
v19.0.2
v20.*
v20.0.0
v20.0.1
v20.0.10
v20.0.11
v20.0.2
v20.0.3
v20.0.4
v20.0.5
v20.0.6
v20.0.7
v20.0.8
v20.0.9
v20.1.0
v20.1.1
v20.2.0
v20.3.0
v20.3.1
v20.3.2
v20.3.3
v20.3.4
v20.3.5
v20.3.6
v20.3.7
v20.3.8
v20.3.9
v20.4.0
v20.5.0
v20.5.1
v20.5.2
v20.5.3
v20.5.4
v20.5.5
v20.6.0
v20.6.1
v20.6.2
v20.6.3
v20.6.4
v20.6.5
v20.7.0
v20.7.1
v20.7.2
v20.8.0
v20.8.1
v20.8.2
v20.8.3
v20.8.4
v20.8.5
v20.8.6
v20.8.7

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-33943.json"