Xen is vulnerable to regular expression denial of service (ReDoS) attacks. An attacker is able to manipulate the application by inserting unknown input leads resulting in denial of service conditions.
lists.fedoraproject.org/archives/list/[email protected]/message/I7ZGWVVRI4XY2XSTBI3XEMWBXPDVX6OT/
lists.fedoraproject.org/archives/list/[email protected]/message/PXUI4VMD52CH3T7YXAG3J2JW7ZNN3SXF/
secdb.alpinelinux.org/v3.11/main.yaml
secdb.alpinelinux.org/v3.12/main.yaml
www.debian.org/security/2021/dsa-5017
xenbits.xenproject.org/xsa/advisory-385.txt