CVE-2022-23476: Nokogiri

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

Nokogiri is an open source XML and HTML library for the Ruby programming language. Nokogiri `1.13.8` and `1.13.9` fail to check the return value from `xmlTextReaderExpand` in the method `Nokogiri::XML::Reader#attribute_hash`. This can lead to a null pointer exception when invalid markup is being parsed. For applications using `XML::Reader` to parse untrusted inputs, this may potentially be a vector for a denial of service attack. Users are advised to upgrade to Nokogiri `>= 1.13.10`. Users may be able to search their code for calls to either `XML::Reader#attributes` or `XML::Reader#attribute_hash` to determine if they are affected.

Affected products

• Nokogiri Nokogiri: version 1.13.8 only; version 1.13.9 only

Published 2022-12-08. Last modified 2026-06-17.