要点
- CVE-2021-41098 は nokogiri, nokogiri (nokogiri) に影響する深刻度「高」 (CVSS 7.5) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：1.5%（全脆弱性の 73.6% より高い）。
- 対処：1.12.5 以降に更新してください。
概要
Severity
The Nokogiri maintainers have evaluated this as High Severity 7.5 (CVSS3.0) for JRuby users. (This security advisory does not apply to CRuby users.)
Impact
In Nokogiri v1.12.4 and earlier, on JRuby only, the SAX parser resolves external entities by default.
Users of Nokogiri on JRuby who parse untrusted documents using any of these classes are affected:
- Nokogiri::XML::SAX::Parser
- Nokogiri::HTML4::SAX::Parser or its alias Nokogiri::HTML::SAX::Parser
- Nokogiri::XML::SAX::PushParser
- Nokogiri::HTML4::SAX::PushParser or its alias Nokogiri::HTML::SAX::PushParser
Mitigation
JRuby users should upgrade to Nokogiri v1.12.5 or later. There are no workarounds available for v1.12.4 or earlier.
CRuby users are not affected.
NVD の説明
Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support. In Nokogiri v1.12.4 and earlier, on JRuby only, the SAX parser resolves external entities by default. Users of Nokogiri on JRuby who parse untrusted documents using any of these classes are affected: Nokogiri::XML::SAX::Parse, Nokogiri::HTML4::SAX::Parser or its alias Nokogiri::HTML::SAX::Parser, Nokogiri::XML::SAX::PushParser, and Nokogiri::HTML4::SAX::PushParser or its alias Nokogiri::HTML::SAX::PushParser. JRuby users should upgrade to Nokogiri v1.12.5 or later to receive a patch for this issue. There are no workarounds available for v1.12.4 or earlier. CRuby users are not affected.
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