CVE-2023-54354
Malformed XML Schema in Nokogiri/libxml2 allows NULL deref causing process crash (DoS).
Is CVE-2023-54354 being exploited?
Not confirmed. CVE-2023-54354 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 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2023-54354?
CVE-2023-54354 is rated High. 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-2023-54354?
Yes. A fix has been recorded for CVE-2023-54354. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2023-54354 affect?
CVE-2023-54354 affects Nokogiri (CRuby) < 1.14.3 with packaged libxml2 v2.10.3, libxml2 v2.10.3, Ruby apps using the affected Nokogiri build. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2023-54354?
Upgrade Nokogiri to >=1.14.3 (libxml2 2.10.4) and validate/restrict XML schema inputs.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote denial-of-service: crafted XML Schema triggers libxml2 NULL pointer deref via Nokogiri, causing segfaults and application crashes.
Patch when possible