CVE-2026-128068
rails-html-sanitizer: Possible regular expression denial of service with certain configurations
rails-html-sanitizer is responsible for sanitizing HTML fragments in Rails applications. From 1.0.3 through 1.7.1, Rails::HTML::PermitScrubber checks SVG href and xlink:href local references with a pattern whose line-start anchor and whitespace class cause an all-whitespace value to be rescanned from each line start. An attacker who supplies HTML can cause quadratic CPU consumption when an application customizes its allowed tags to include an SVG reference element such as use and permits href or xlink:href. The default allowed tag configuration is not affected. CRuby 3.2 and later uses linear-time regular expression matching for this pattern, while CRuby 3.1 and earlier and JRuby are affected. This issue is fixed in version 1.7.2.
Fixes and workarounds
Fix
rails-html-sanitizer (RubyGems): OSV reports a fixed version 1.7.2. Check the advisory for supported release branches.
Source: OSV GHSA-cpgf-5mjf-73p7Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| rails-html-sanitizer rails |
>= 1.0.3, < 1.7.2 (affected) | CNA: GitHub_M |
rails-html-sanitizerrails-html-sanitizer
RubyGems |
1.0.3 (affected, RubyGems) 1.0.4 (affected, RubyGems) 1.1.0 (affected, RubyGems) 1.2.0 (affected, RubyGems) 1.3.0 (affected, RubyGems) 1.4.0 (affected, RubyGems) 1.4.1 (affected, RubyGems) 1.4.2 (affected, RubyGems) 1.4.3 (affected, RubyGems) 1.4.4 (affected, RubyGems) 1.5.0 (affected, RubyGems) 1.6.0 (affected, RubyGems) 1.6.0.rc1 (affected, RubyGems) 1.6.0.rc2 (affected, RubyGems) 1.6.1 (affected, RubyGems) 1.6.2 (affected, RubyGems) 1.7.0 (affected, RubyGems) 1.7.1 (affected, RubyGems) Ecosystem version events: introduced 1.0.3; fixed 1.7.2 Source events (ECOSYSTEM)Other versions: unaffected |
OSV GHSA-cpgf-5mjf-73p7 |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 5.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L | CNA: GitHub_M |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/rails/rails-html-sanitizer/security/advisories/GHSA-cpgf-5mjf-73p7CNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/rails/rails-html-sanitizer/commit/f776f963b9d9346271aade9cb903e793fd38e865CNA: GitHub_M · x_refsource_MISC
- https://github.com/rails/rails-html-sanitizer/releases/tag/v1.7.2CNA: GitHub_M · x_refsource_MISC
- https://github.com/advisories/GHSA-cpgf-5mjf-73p7OSV / GitHub Security Advisories · advisory
- https://osv.dev/vulnerability/GHSA-cpgf-5mjf-73p7OSV / GitHub Security Advisories · osv
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