xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to newDoc->oldNs.
https://gitlab.gnome.org/GNOME/libxml2/commit/5a02583c7e683896d84878bd90641d8d9b0d0549
https://lists.debian.org/debian-lts-announce/2019/12/msg00032.html
https://security.netapp.com/advisory/ntap-20200114-0002/
https://usn.ubuntu.com/4274-1/
http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00047.html
http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00005.html
https://www.oracle.com/security-alerts/cpujul2020.html
https://lists.debian.org/debian-lts-announce/2020/09/msg00009.html
https://cert-portal.siemens.com/productcert/pdf/ssa-292794.pdf
Source: MITRE
Published: 2019-12-24
Updated: 2021-07-21
Type: CWE-772
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 10
Severity: MEDIUM
Base Score: 7.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 3.9
Severity: HIGH