CVE-2026-126206

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Source
https://cve.org/CVERecord?id=CVE-2026-126206
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126206.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-126206
Aliases
Published
2026-11-12T20:51:36Z
Modified
2026-11-13T10:46:20Z
Severity
  • 5.3 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N CVSS Calculator
Summary
Loofah allowed_uri? treats data:text/html as safe text/plain
Details

Loofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. In 2.25.2, Loofah::HTML5::Scrub.allowed_uri? treats a data URI mediatype containing the HTML5 named solidus reference / as malformed and falls back to the allowed text/plain, while a browser decodes the reference and interprets the same value as text/html. An application that validates a user-controlled URL with this helper and renders the approved value in href or another browser-interpreted URI attribute can allow cross-site scripting. Rails::HTML::Sanitizer.allowed_uri? re-exports the affected helper. Loofah's default sanitize() path is not affected because Nokogiri decodes the entity before URI validation. This issue is fixed in version 2.25.3.

Database specific 
{
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
        "CWE-184",
        "CWE-79"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/126xxx/CVE-2026-126206.json"
}
References

Affected packages

Git / github.com/flavorjones/loofah

Affected ranges

Type
GIT
Repo
https://github.com/flavorjones/loofah
Events
Introduced
2706d7e858426ba856d9711b0e761b2fee7986c4
Last Affected
2706d7e858426ba856d9711b0e761b2fee7986c4
Fixed
ad92002966053309f83b550861e2ef04bc714744
Fixed
bbe007e52e8aeaa520b3e515235d467f5b1416e6
Database specific
Show details 
{
    "extracted_events": [
        {
            "range": [
                {
                    "introduced": "= 2.25.2"
                },
                {
                    "last_affected": "= 2.25.2"
                }
            ],
            "source": "AFFECTED_FIELD",
            "strategy": "StandaloneSingleVersion"
        },
        {
            "range": [
                {
                    "fixed": "ad92002966053309f83b550861e2ef04bc714744"
                }
            ],
            "source": "REFERENCES_COMMIT"
        },
        {
            "original_tag": "v2.25.3",
            "range": [
                {
                    "fixed": "bbe007e52e8aeaa520b3e515235d467f5b1416e6"
                }
            ],
            "source": "REFERENCES_TAG"
        }
    ]
}

Affected versions

= 2.*
= 2.25.2
v2.*
v2.25.2

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-126206.json"