Nokogiri before 1.15.6 and 1.16.x before 1.16.2 (CRuby, when using the packaged libxml2) is affected by a use-after-free vulnerability in libxml2 (CVE-2024-25062) in the xmlTextReader module, which underlies Nokogiri::XML::Reader. When using the XML Reader interface with DTD validation and XInclude expansion enabled, processing a crafted XML document can lead to an xmlValidatePopElement use-after-free. Nokogiri 1.15.6 and 1.16.2 resolve this by upgrading the packaged libxml2 to 2.11.7 and 2.12.5 respectively. JRuby and installations using system libxml2 are not affected.

Nokogiri versions before 1.15.6 and 1.16.x before 1.16.2 (CRuby with packaged libxml2) are affected by a use-after-free vulnerability in libxml2 tracked as CVE-2024-25062. The flaw exists in the xmlTextReader module, which underlies Nokogiri::XML::Reader. Exploitation requires using the XML Reader interface with DTD validation and XInclude expansion enabled, where processing a crafted XML document can trigger an xmlValidatePopElement use-after-free condition. The vulnerability is resolved in Nokogiri 1.15.6 and 1.16.2 by upgrading the packaged libxml2 to versions 2.11.7 and 2.12.5 respectively. JRuby-based installations and those using the system-installed libxml2 are not affected by this issue.