In libxml2 before 2.9.14, several buffer handling functions in buf.c (xmlBuf*) and tree.c (xmlBuffer*) don't check for integer overflows. This can result in out-of-bounds memory writes. Exploitation requires a victim to open a crafted, multi-gigabyte XML file. Other software using libxml2's buffer functions, for example libxslt through 1.1.35, is affected as well.
https://gitlab.gnome.org/GNOME/libxml2/-/tags/v2.9.14
https://gitlab.gnome.org/GNOME/libxml2/-/commit/6c283d83eccd940bcde15634ac8c7f100e3caefd
https://gitlab.gnome.org/GNOME/libxslt/-/tags
https://gitlab.gnome.org/GNOME/libxml2/-/commit/2554a2408e09f13652049e5ffb0d26196b02ebab
https://lists.debian.org/debian-lts-announce/2022/05/msg00023.html
https://www.debian.org/security/2022/dsa-5142
http://packetstormsecurity.com/files/167345/libxml2-xmlBufAdd-Heap-Buffer-Overflow.html
https://security.netapp.com/advisory/ntap-20220715-0006/
https://www.oracle.com/security-alerts/cpujul2022.html
https://security.gentoo.org/glsa/202210-03
http://packetstormsecurity.com/files/169825/libxml2-xmlParseNameComplex-Integer-Overflow.html
Source: MITRE
Published: 2022-05-03
Updated: 2023-01-11
Type: CWE-190
Base Score: 4.3
Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P
Impact Score: 2.9
Exploitability Score: 8.6
Severity: MEDIUM
Base Score: 6.5
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 2.8
Severity: MEDIUM