RubySec

Providing security resources for the Ruby community

CVE-2022-23476 (nokogiri): Unchecked return value from xmlTextReaderExpand

ADVISORIES

GEM

nokogiri

SEVERITY

CVSS v3.x: 7.5 (High)

UNAFFECTED VERSIONS

  • <= 1.13.7

PATCHED VERSIONS

  • >= 1.13.10

DESCRIPTION

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 &gt;= 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.