Nokogiri updates packaged libxml2 to v2.12.7 to resolve CVE-2024-34459

Summary

Nokogiri v1.16.5 upgrades its dependency libxml2 to
2.12.7 from 2.12.6.

libxml2 v2.12.7 addresses CVE-2024-34459:

• described at https://gitlab.gnome.org/GNOME/libxml2/-/issues/720
• patched by https://gitlab.gnome.org/GNOME/libxml2/-/commit/2876ac53

Impact

There is no impact to Nokogiri users because the issue is present only
in libxml2’s xmllint tool which Nokogiri does not provide or expose.

Timeline

• 2024-05-13 05:57 EDT, libxml2 2.12.7 release is announced
• 2024-05-13 08:30 EDT, nokogiri maintainers begin triage
• 2024-05-13 10:05 EDT, nokogiri v1.16.5 is released
  and this GHSA made public