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
Credit
This vulnerability was responsibly reported by @davidwilemski.
Summary
Nokogiri
1.13.8, 1.13.9fails to check the return value fromxmlTextReaderExpandin the methodNokogiri::XML::Reader#attribute_hash. This can lead to a null pointer exception when invalid markup is being parsed.For applications using
XML::Readerto 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#attributesorXML::Reader#attribute_hashto determine if they are affected.Severity
The Nokogiri maintainers have evaluated this as High Severity 7.5 (CVSS3.1).
References
Credit
This vulnerability was responsibly reported by @davidwilemski.