Cross-site Scripting (XSS) Affecting rails package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN14-RAILS-22421898
- published11 Nov 2026
- disclosed10 Nov 2026
Introduced: 10 Nov 2026
NewCVE-2026-126079 (opens in a new tab)How to fix?
There is no fixed version for Debian:14 rails.
NVD Description
Note: Versions mentioned in the description apply only to the upstream rails package and not the rails package as distributed by Debian.
See How to fix? for Debian:14 relevant fixed versions and status.
Action View is a framework for handling view template lookup and rendering and provides view helpers for building HTML. Prior to 8.1.4.1 and 8.0.5.2, with the HTML5 sanitizer (Rails::HTML5::Sanitizer, the default vendor on CRuby for applications using load_defaults 7.1 or later), Nokogiri before 1.19.5 serializes < and > unescaped inside attribute values. The Action View text helpers highlight and simple_format sanitize their input and then process the resulting HTML as a string: highlight splits it on tag boundaries to insert matches, and simple_format splits it into paragraphs on blank lines. An unescaped > or a blank line inside an attribute value could cause markup in that value, which the sanitizer left inert, to be emitted as live elements in the helper's html_safe output, possibly leading to XSS. Applications that use the HTML5 sanitizer and pass untrusted text to highlight, or to simple_format with html_options, are affected. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.
References
- https://security-tracker.debian.org/tracker/CVE-2026-126079
- http://github.com/rails/rails/commit/adc3a32d4abea77ed3aacf6f5fb71cfc005bef73
- https://github.com/rails/rails/commit/009ea68342d05d02087c04dae7faaa4e4c1def11
- https://github.com/rails/rails/releases/tag/v8.0.5.2
- https://github.com/rails/rails/releases/tag/v8.1.4.1
- https://github.com/rails/rails/security/advisories/GHSA-2p2f-4rq4-gjwc