Answer in brief
CVE-2026-128068 records a Medium severity (CVSS 5.3) vulnerability in rails-html-sanitizer: Possible regular expression denial of service with certain configurations. The current sources do not mark it as known exploited. The current feed maps rails/rails-html-sanitizer (generic), rails-html-sanitizer (rubygems), rails-html-sanitizer (rubygems). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps rails/rails-html-sanitizer (generic), rails-html-sanitizer (rubygems), rails-html-sanitizer (rubygems). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| rails/rails-html-sanitizergeneric | >=1.0.3 <1.7.2 | 1.7.2 |
| rails-html-sanitizerrubygems | >=1.0.3,<1.7.2 | 1.7.2 |
| rails-html-sanitizerrubygems | >=1.0.3 <1.7.2 | 1.7.2 |
Published upstream
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 13, 2026
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.
Quoted source text, attributed separately from HOL analysis.