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.
| CWE | CWE-400 CWE-1333 |
| Vendor | rails |
| Product | rails-html-sanitizer |
| Published | Nov 13, 2026 |
Get instant alerts for rails rails-html-sanitizer
Be the first to know when new medium vulnerabilities affecting rails rails-html-sanitizer are published — delivered to Slack, Telegram or Discord.
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L