CVE-2026-41238

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Source
https://cve.org/CVERecord?id=CVE-2026-41238
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41238.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-41238
Aliases
Downstream
CGA (78)
CLEANSTART (3)
CLSA (20)
DEBIAN (1)
ECHO (1)
MINI (11)
ROOT (1)
UBUNTU (1)
Published
2026-04-23T14:43:17Z
Modified
2026-10-21T02:57:13Z
Severity
  • 6.9 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N CVSS Calculator
Summary
DOMPurify: Prototype Pollution to XSS Bypass via CUSTOM_ELEMENT_HANDLING Fallback
Details

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions 3.0.1 through 3.3.3 are vulnerable to a prototype pollution-based XSS bypass. When an application uses DOMPurify.sanitize() with the default configuration (no CUSTOM_ELEMENT_HANDLING option), a prior prototype pollution gadget can inject permissive tagNameCheck and attributeNameCheck regex values into Object.prototype, causing DOMPurify to allow arbitrary custom elements with arbitrary attributes — including event handlers — through sanitization. Version 3.4.0 fixes the issue.

Database specific 
{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-1321",
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41238.json"
}
References

Affected packages

Git / github.com/cure53/dompurify

Affected ranges

Type
GIT
Repo
https://github.com/cure53/dompurify
Events
Introduced
e42464f0e06ab5899aae41c89920be9af8b2e826
Fixed
5b16e0b892e82b1779d62b9928b43c4c4ff290b9
Database specific
Show details 
{
    "extracted_events":  [
        {
            "range":  [
                {
                    "introduced":  "3.0.1"
                },
                {
                    "fixed":  "3.4.0"
                }
            ],
            "source":  "AFFECTED_FIELD",
            "strategy":  "StringRangeExpression"
        },
        {
            "original_tag":  "3.4.0",
            "range":  [
                {
                    "fixed":  "5b16e0b892e82b1779d62b9928b43c4c4ff290b9"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41238.json"