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CVE-2026-126208

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

4.7 mediumFix available

Medium (4.7) in flavorjones loofah. Fixed in loofah 2.25.3.

On this page
Loofah 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.

Severity

CVSS 3.1

4.7 medium
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
CWEs
CWE-178 Improper Handling of Case Sensitivity
CWE-184 Incomplete List of Disallowed Inputs
Published
Modified
Assigned by
GitHub_M (CNA)
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
flavorjones loofah< 2.25.3

Packages (OSV)

AdvisoryEcosystemPackageAffectedFixed in
GHSA-345x-3rq2-jfrmRubyGemsloofah<2.25.32.25.3

Attack patterns (CAPEC)

  • CAPEC-3 Using Leading 'Ghost' Character Sequences to Bypass Input Filters Likelihood: Medium · Severity: Medium
  • CAPEC-6 Argument Injection Likelihood: High · Severity: High
  • CAPEC-15 Command Delimiters Likelihood: High · Severity: High
  • CAPEC-43 Exploiting Multiple Input Interpretation Layers Likelihood: Medium · Severity: High
  • CAPEC-71 Using Unicode Encoding to Bypass Validation Logic Likelihood: Medium · Severity: High
  • CAPEC-73 User-Controlled Filename Likelihood: High · Severity: High
  • CAPEC-85 AJAX Footprinting Likelihood: High · Severity: Low
  • CAPEC-120 Double Encoding Likelihood: Low · Severity: Medium
  • CAPEC-182 Flash Injection Likelihood: High · Severity: Medium

The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits.

References

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