Description
Nokogiri is an open source XML and HTML library for the Ruby programming language. From 1.12.0 until 1.19.5, the C extension on CRuby and TruffleRuby has a Nokogiri::HTML5 serializer that does not escape text inside noscript elements or angle brackets inside attribute values. When an application sanitizes untrusted HTML with the default parsing options, allows noscript, and sends serialized output to a scripting-enabled browser, the browser can parse markup that Nokogiri did not produce, enabling mutation cross-site scripting. Using parse_noscript_content_as_text: true is the recommended workaround, not the vulnerable default. JRuby is not affected because it does not implement Nokogiri::HTML5. This issue is fixed in version 1.19.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| sparklemotion | nokogiri | >= 1.12.0, < 1.19.5 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | ruby-nokogiri | No fix yet | — |
| Debian 13 | ruby-nokogiri | No fix yet | — |
| Debian 12 | ruby-nokogiri | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | ruby-nokogiri | No fix yet | — |
| Ubuntu 26.04 LTS | ruby-nokogiri | No fix yet | — |
| Ubuntu 24.04 LTS | ruby-nokogiri | No fix yet | — |
| Ubuntu 18.04 LTS | ruby-nokogiri | No fix yet | — |
| Ubuntu 16.04 LTS | ruby-nokogiri | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | ruby-nokogiri | No fix yet | — |
| Ubuntu Pro 20.04 LTS | ruby-nokogiri | No fix yet | — |
| Ubuntu Pro 14.04 LTS | ruby-nokogiri | No fix yet | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | rubygem-nokogiri | No fix yet | — |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | logstash-9.3 +2 | No fix yet | — |
| Wolfi rolling | logstash-9.4 +1 | 9.4.9-r1 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| RubyGems | nokogiri | >= 1.12.0, < 1.19.5 | 1.19.5 | GHSA-4p39-36wj-23h4 |
References
- https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-4p39-36wj-23h4
- https://github.com/sparklemotion/nokogiri/pull/3752
- https://github.com/sparklemotion/nokogiri/commit/3e84df6ff7ab4d78f446e3a415430bd69a055d32
- https://github.com/sparklemotion/nokogiri/commit/c6c0bffbdcd194694995acafeeed27326b0805f8
- https://github.com/sparklemotion/nokogiri/releases/tag/v1.19.5