Illustrator versions 28.5, 27.9.4 and earlier are affected by an Improper Input Validation vulnerability that could lead to an application denial-of-service condition. An attacker could exploit this vulnerability to render the application unresponsive or terminate its execution. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
https://helpx.adobe.com/security/products/illustrator/apsb24-45.html