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fkie_cve-2026-126079

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.

GHSA-2p2f-4rq4-gjwc — Action View: Possible XSS vulnerability in text helpers

Affected: RubyGems: actionview

### Impact 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.

### Details The fixed releases require rails-html-sanitizer 1.7.2 or later, which requires Loofah 2.25.3 and Nokogiri 1.19.5. With these versions, the HTML5 sanitizer escapes `<` and `>` in attribute values as `<` and `>`, as the HTML4 sanitizer already does. The parsed DOM is unchanged, but code or tests that compare sanitized HTML as a string may see the new serialization.

### Workarounds Upgrade Nokogiri to 1.19.5 or later; the escaping is in its HTML5 serializer, so no Rails upgrade is needed. Alternatively, use the HTML4 sanitizer by setting `config.action_view.sanitizer_vendor = Rails::HTML4::Sanitizer`.

### Releases The fixed releases are a…

UBUNTU-CVE-2026-126079

Affected: Ubuntu:Pro:16.04:LTS: rails, Ubuntu:Pro:18.04:LTS: rails, Ubuntu:Pro:20.04:LTS: rails, Ubuntu:Pro:22.04:LTS: rails, Ubuntu:24.04:LTS: rails, Ubuntu:26.10: rails, Ubuntu:26.04:LTS: rails

WID-SEC-W-2026-4317 — Ruby on Rails: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Ruby on Rails ausnutzen, um beliebigen Programmcode auszuführen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Daten zu manipulieren, um falsche Informationen darzustellen, um einen Cross-Site Scripting Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.