libxml2 2.9.8, if --with-lzma is used, allows remote attackers to cause a denial of service (infinite loop) via a crafted XML file that triggers LZMA_MEMLIMIT_ERROR, as demonstrated by xmllint, a different vulnerability than CVE-2015-8035 and CVE-2018-9251.
https://usn.ubuntu.com/3739-1/
https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
https://lists.debian.org/debian-lts-announce/2018/09/msg00035.html
https://gitlab.gnome.org/GNOME/libxml2/commit/2240fbf5912054af025fb6e01e26375100275e74