CVE-2022-51000 sparklemotion CVE debrief

Who should care

Users of Nokogiri, especially those using versions before 1.13.2, should be aware of the potential vulnerabilities and take steps to upgrade or mitigate the risks. This includes reviewing and updating affected systems, monitoring for potential denial-of-service attacks, and considering compensating controls for exposed systems. Security teams should prioritize vulnerability management and ensure that their asset inventory is up-to-date to address potential exposure to these vulnerabilities in Nokogiri's vendored libraries, libxml2 and libxslt, and take steps to protect their environments accordingly, based on the CVE and NVD records provided by official sources like the CVE Program and NIST NVD detail pages. Operators of systems using Nokogiri should also assess their platform-specific vulnerability to these denial-of-service attacks and plan for vendor-supported updates or mitigations through normal change control where exposure is confirmed. This may involve confirming whether affected product deployments exist in managed environments and assigning an owner for follow-up, as well as tracking exceptions, retesting remediated assets, and closing the item only after evidence is documented. Security teams should also review compensating controls for exposed systems while remediation is scheduled and verified, and check relevant monitoring, detection, and logs for exposed assets that need extra review, based on the official CVE record and source-specific vulnerability assessment provided by the CVE Program and NIST NVD detail pages. Finally, users should consider the operational impact of these vulnerabilities on their systems and prioritize defensive measures accordingly, such as upgrading to Nokogiri version 1.13.2 or later, and reviewing the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance. This should be done in the context of their overall vulnerability management and security practices, with a focus on minimizing potential operational impact and ensuring the security of their environments. To further protect their systems, users should also consider implementing monitoring and detection measures to identify, 7

Technical summary

Nokogiri before 1.13.2 (CRuby, when using packaged libraries) is vulnerable to denial-of-service attacks due to its use of outdated libxml2 and libxslt versions. Specifically, it ships with libxml2 2.9.12 and libxslt 1.1.34, which are affected by CVE-2021-30560 and CVE-2022-23308, respectively. Users of Nokogiri should review their systems and consider upgrading to version 1.13.2 or later to address these vulnerabilities.

Defensive priority

Nokogiri users should prioritize upgrading to version 1.13.2 or later to address vulnerabilities in vendored libxml2 and libxslt.

Recommended defensive actions

• Upgrade Nokogiri to version 1.13.2 or later
• Review and update affected systems using Nokogiri
• Monitor for potential denial-of-service attacks
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE is based on Nokogiri's use of vulnerable versions of libxml2 and libxslt. Specifically, Nokogiri before 1.13.2 (CRuby, when using packaged libraries) ships vendored libxml2 2.9.12 and libxslt 1.1.34. These versions are affected by CVE-2021-30560 in libxslt and CVE-2022-23308 in libxml2. Users should verify their deployments and review official advisories for mitigation steps. Defenders should check for potential denial-of-service attacks and monitor systems for suspicious activity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.