Loofah: SVG `<textPath>` and `<mpath>` bypass local-reference restriction

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-126208
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-12 21:17:22 UTC
Updated2026-11-12 22:09:39 UTC
DescriptionLoofah is a general library for manipulating and transforming HTML/XML documents and fragments, built on top of Nokogiri. Prior to 2.25.3, Loofah's SVG_ALLOW_LOCAL_HREF safelist lists textPath with lowercase spelling that does not match the HTML5 parser's element name and omits mpath, so external href and xlink:href values on those elements survive sanitization. Firefox fetches the attacker-chosen URL when a viewer renders the content, which can disclose the viewer's IP address, user agent, referrer, and access to hosts routable only from the viewer's network. Chrome and WebKit do not fetch these references, and the impact is a network request rather than script execution. The rails-html-sanitizer PermitScrubber reuses the affected safelist when SVG elements are permitted. This issue is fixed in version 2.25.3.

Risk And Classification

Primary CVSS: v3.1 4.7 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Problem Types: CWE-178 | CWE-184 | CWE-178 CWE-178: Improper Handling of Case Sensitivity | CWE-184 CWE-184: Incomplete List of Disallowed Inputs

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
3.1CNADECLARED4.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Flavorjones Loofah affected < 2.25.3 Not specified

References

ReferenceSourceLinkTags
github.com/flavorjones/loofah/pull/324 [email protected] github.com
github.com/flavorjones/loofah/commit/cdd6ff7fb51998eb181bd2da925ddbcfcc8... [email protected] github.com
github.com/flavorjones/loofah/releases/tag/v2.25.3 [email protected] github.com
github.com/flavorjones/loofah/security/advisories/GHSA-345x-3rq2-jfrm [email protected] github.com
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