OpenPrinting CUPS is an open source printing system for Linux and other Unix-like operating systems. In versions 2.4.16 and prior, CUPS daemon (cupsd) contains an authorization bypass vulnerability due to case-insensitive username comparison during authorization checks. The vulnerability allows an unprivileged user to gain unauthorized access to restricted operations by using a user with a username that differs only in case from an authorized user. At time of publication, there are no publicly available patches.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade cups | Apr 29, 2026 | Apr 3, 2026 |
| Amazon_linux_2023 | — | Upgrade cups-debugsourceUpgrade cups-lpd-debuginfoUpgrade cups-filesystemUpgrade cups-clientUpgrade cups-lpdUpgrade cupsUpgrade cups-ipptoolUpgrade cups-ipptool-debuginfoUpgrade cups-debuginfoUpgrade cups-printerappUpgrade cups-libs-debuginfoUpgrade cups-develUpgrade cups-printerapp-debuginfoUpgrade cups-client-debuginfoUpgrade cups-libs | May 19, 2026 | Apr 3, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Apr 3, 2026 |
| Ubuntu | — | Upgrade cupsUpgrade cups-daemon | Jun 9, 2026 | Jun 8, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Apr 3, 2026 |
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