CVE-2026-41240

DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Versions prior to 3.4.0 have an inconsistency between FORBID_TAGS and FORBID_ATTR handling when function-based ADD_TAGS is used. Commit c361baa added an early exit for FORBID_ATTR at line 1214. The same fix was not applied to FORBID_TAGS. At line 1118-1123, when EXTRA_ELEMENT_HANDLING.tagCheck returns true, the short-circuit evaluation skips the FORBID_TAGS check entirely. This allows forbidden elements to survive sanitization with their attributes intact. Version 3.4.0 patches the issue.

Database specific

{
    "cna_assigner":  "GitHub_M",
    "cwe_ids":  [
        "CWE-183",
        "CWE-79"
    ],
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/41xxx/CVE-2026-41240.json"
}

References

Affected packages

Git / github.com/cure53/dompurify

Affected ranges

Type

GIT

Repo

https://github.com/cure53/dompurify

Events

Introduced

Fixed

5b16e0b892e82b1779d62b9928b43c4c4ff290b9

Fixed

c361baa18dbdcb3344a41110f4c48ad85bf48f80

Database specific

Show details

{
    "extracted_events":  [
        {
            "cpe":  "cpe:2.3:a:cure53:dompurify:*:*:*:*:*:*:*:*",
            "range":  [
                {
                    "introduced":  "0"
                },
                {
                    "fixed":  "3.4.0"
                }
            ],
            "source":  "CPE_RANGE"
        },
        {
            "range":  [
                {
                    "fixed":  "c361baa18dbdcb3344a41110f4c48ad85bf48f80"
                }
            ],
            "source":  "REFERENCES_COMMIT"
        },
        {
            "original_tag":  "3.4.0",
            "range":  [
                {
                    "fixed":  "5b16e0b892e82b1779d62b9928b43c4c4ff290b9"
                }
            ],
            "source":  "REFERENCES_TAG"
        }
    ]
}

Affected versions

0.*

0.1

0.3

0.4

0.4.2

0.4.3

0.4.4

0.4.5

0.6.0

0.6.1

0.6.2

0.6.3

0.6.4

0.6.5

0.6.6

0.6.7

0.7.0

0.7.1

0.7.2

0.7.3

0.8.0

0.8.1

0.8.2

0.8.3

0.8.4

0.8.5

0.8.6

0.8.7

0.8.8

0.8.9

0.9.0

1.*

1.0.0

1.0.1

1.0.10

1.0.11

1.0.2

1.0.3

1.0.4

1.0.5

1.0.6

1.0.7

1.0.8

1.0.9

2.*

2.0.0

2.0.1

2.0.10

2.0.11

2.0.12

2.0.13

2.0.14

2.0.15

2.0.16

2.0.17

2.0.2

2.0.3

2.0.4

2.0.5

2.0.6

2.0.8

2.0.9

2.1.0

2.1.1

2.2.0

2.2.2

2.2.3

2.2.4

2.2.6

2.2.7

2.2.8

2.2.9

2.3.0

2.3.1

2.3.10

2.3.11

2.3.12

2.3.2

2.3.3

2.3.4

2.3.5

2.3.6

2.3.8

2.3.9

2.4.0

2.4.1

2.4.2

2.4.3

3.*

3.0.4

3.1.3

3.2.3

v0.*

v0.3

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-41240.json"