Nokogiri is a widely used Ruby XML library; bundled libxml2/libxslt flaws can enable DoS, data disclosure, or RCE across many web apps, so broad IT notification is warranted.
CVE-2022-51000
Nokogiri's vendored libxml2/libxslt enable DoS, info leak, or possible RCE.
Is CVE-2022-51000 being exploited?
Not confirmed. CVE-2022-51000 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.44% probability of exploitation in the next 30 days.
How severe is CVE-2022-51000?
CVE-2022-51000 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2022-51000?
Yes. A fix has been recorded for CVE-2022-51000. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2022-51000 affect?
CVE-2022-51000 affects Nokogiri < 1.13.2 (CRuby packaged libs), libxml2 2.9.12, libxslt 1.1.34, Ruby applications using Nokogiri. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2022-51000?
Upgrade Nokogiri to >=1.13.2 and avoid parsing untrusted XML/XSL; enable safe parsing options.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Parsing untrusted XML/XSL can result in denial of service, memory disclosure, or remote code execution via libxml2/libxslt.
Immediate action required