A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery mode and post-validated, the flaw could be used to crash the application. The highest threat from this vulnerability is to system availability.
https://www.oracle.com/security-alerts/cpuoct2021.html
https://www.oracle.com/security-alerts/cpujul2022.html
https://www.oracle.com/security-alerts/cpuapr2022.html
https://security.netapp.com/advisory/ntap-20210625-0002/
https://security.gentoo.org/glsa/202107-05
https://lists.debian.org/debian-lts-announce/2021/05/msg00008.html