Due to failure in validating the length provided by an attacker-crafted PPD PostScript document, CUPS and libppd are susceptible to a heap-based buffer overflow and possibly code execution. This issue has been fixed in CUPS version 2.4.7, released in September of 2023.
https://takeonme.org/cves/CVE-2023-4504.html
https://lists.debian.org/debian-lts-announce/2023/09/msg00041.html
https://github.com/OpenPrinting/libppd/security/advisories/GHSA-4f65-6ph5-qwh6
https://github.com/OpenPrinting/cups/security/advisories/GHSA-pf5r-86w9-678h