{"id":"DEBIAN-CVE-2026-126079","details":"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 \u003c and \u003e 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 \u003e 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.","modified":"2026-11-11T11:00:07.756231185Z","published":"2026-11-10T21:19:26.513Z","upstream":["CVE-2026-126079"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-126079"}],"affected":[{"package":{"name":"rails","ecosystem":"Debian:12","purl":"pkg:deb/debian/rails?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:6.1.7.10+dfsg-1~deb12u1","2:6.1.7.10+dfsg-1~deb12u2","2:6.1.7.10+dfsg-1~deb12u3","2:6.1.7.3+dfsg-1","2:6.1.7.3+dfsg-10","2:6.1.7.3+dfsg-11","2:6.1.7.3+dfsg-12","2:6.1.7.3+dfsg-13","2:6.1.7.3+dfsg-2","2:6.1.7.3+dfsg-2~deb12u1","2:6.1.7.3+dfsg-3","2:6.1.7.3+dfsg-4","2:6.1.7.3+dfsg-5","2:6.1.7.3+dfsg-6","2:6.1.7.3+dfsg-7","2:6.1.7.3+dfsg-7~exp1","2:6.1.7.3+dfsg-8","2:6.1.7.3+dfsg-9","2:7.2.2.1+dfsg-1","2:7.2.2.1+dfsg-1~exp1","2:7.2.2.1+dfsg-1~exp2","2:7.2.2.1+dfsg-1~exp3","2:7.2.2.1+dfsg-1~exp4","2:7.2.2.1+dfsg-1~exp6","2:7.2.2.1+dfsg-2","2:7.2.2.1+dfsg-3","2:7.2.2.1+dfsg-4","2:7.2.2.1+dfsg-5","2:7.2.2.1+dfsg-6","2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-1","2:7.2.2.2+dfsg-2","2:7.2.2.2+dfsg-2~deb13u1","2:7.2.2.2+dfsg-2~deb13u2","2:7.2.3+dfsg-1","2:7.2.3+dfsg-2","2:7.2.3+dfsg-3","2:7.2.3.1+dfsg-1","2:7.2.3.2+dfsg-1","2:7.2.3.2+dfsg-2","2:7.2.3.2+dfsg-3","2:7.2.4+dfsg-1","2:7.2.4+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-126079.json"}},{"package":{"name":"rails","ecosystem":"Debian:13","purl":"pkg:deb/debian/rails?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-1","2:7.2.2.2+dfsg-2","2:7.2.2.2+dfsg-2~deb13u1","2:7.2.2.2+dfsg-2~deb13u2","2:7.2.3+dfsg-1","2:7.2.3+dfsg-2","2:7.2.3+dfsg-3","2:7.2.3.1+dfsg-1","2:7.2.3.2+dfsg-1","2:7.2.3.2+dfsg-2","2:7.2.3.2+dfsg-3","2:7.2.4+dfsg-1","2:7.2.4+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-126079.json"}},{"package":{"name":"rails","ecosystem":"Debian:14","purl":"pkg:deb/debian/rails?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2:7.2.2.1+dfsg-7","2:7.2.2.2+dfsg-1","2:7.2.2.2+dfsg-2","2:7.2.2.2+dfsg-2~deb13u1","2:7.2.2.2+dfsg-2~deb13u2","2:7.2.3+dfsg-1","2:7.2.3+dfsg-2","2:7.2.3+dfsg-3","2:7.2.3.1+dfsg-1","2:7.2.3.2+dfsg-1","2:7.2.3.2+dfsg-2","2:7.2.3.2+dfsg-3","2:7.2.4+dfsg-1","2:7.2.4+dfsg-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-126079.json"}}],"schema_version":"1.9.2","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}