Answer in brief
CVE-2026-128069 records a Medium severity (CVSS 4.7) vulnerability in rails-html-sanitizer: Possible XSS via shared scrubber state in concurrent calls. 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 4.7. 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 | <1.7.2 | 1.7.2 |
| rails-html-sanitizerrubygems | <1.7.2 | 1.7.2 |
| rails-html-sanitizerrubygems | >=0 <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. Before 1.7.2, the HTML4 and HTML5 variants of Rails::HTML::SafeListSanitizer reuse one Rails::HTML::PermitScrubber across calls and mutate its tags and attributes without synchronization. In a multithreaded process, concurrent sanitize calls using different tags: or attributes: options can interleave and cause one call to use the other call's allowlist. If a permissive call admits a script element or event-handler attribute, output expected to be sanitized under a stricter policy can retain it and cause cross-site scripting when rendered. Applications that are single-threaded, use one identical allowlist everywhere, or provide a separate scrubber: are not affected. This issue is fixed in version 1.7.2.
Quoted source text, attributed separately from HOL analysis.