GHSA-qv4q-mr5r-qprj Unchecked return value from xmlTextReaderExpand

• RubyGems nokogiri: >= 1.13.8, < 1.13.10 → fixed in 1.13.10

Summary Nokogiri `1.13.8, 1.13.9` fails 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. Mitigation 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. Severity The Nokogiri maintainers have evaluated this as High Severity 7.5 (CVSS3.1). References • CWE - CWE-252: Unchecked Return Value (4.9) • CWE - CWE-476: NULL Pointer Dereference (4.9) Credit This vulnerability was responsibly reported by @davidwilemski.