There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker who is able to supply a crafted file to be processed by an application linked with the affected functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to application availability, with some potential impact to confidentiality and integrity if an attacker is able to use memory information to further exploit the application.
Nokogiri prior to version 1.11.4 used a vulnerable version of libxml2. Nokogiri 1.11.4 updated libxml2 to version 2.9.11 to address this and other vulnerabilities in libxml2.
bugzilla.redhat.com/show_bug.cgi?id=1954232
github.com/rubysec/ruby-advisory-db/blob/master/gems/nokogiri/CVE-2021-3517.yml
github.com/sparklemotion/nokogiri
github.com/sparklemotion/nokogiri/blob/7c19ef5cc6b7c5c36827dd5495f857c6877ec8cf/CHANGELOG.md?plain=1#L579
github.com/sparklemotion/nokogiri/issues/2233
github.com/sparklemotion/nokogiri/issues/2274
gitlab.gnome.org/GNOME/libxml2/-/commit/8598060bacada41a0eb09d95c97744ff4e428f8e
lists.debian.org/debian-lts-announce/2021/05/msg00008.html
lists.fedoraproject.org/archives/list/[email protected]/message/BZOMV5J4PMZAORVT64BKLV6YIZAFDGX6
lists.fedoraproject.org/archives/list/[email protected]/message/QVM4UJ3376I6ZVOYMHBNX4GY3NIV52WV
nvd.nist.gov/vuln/detail/CVE-2021-3517
security.gentoo.org/glsa/202107-05
security.netapp.com/advisory/ntap-20210625-0002
security.netapp.com/advisory/ntap-20211022-0004
www.oracle.com/security-alerts/cpuapr2022.html
www.oracle.com/security-alerts/cpujan2022.html
www.oracle.com/security-alerts/cpujul2022.html
www.oracle.com/security-alerts/cpuoct2021.html