CVE-2026-87876
Fixed in a distro release EPSS <1%CVSS 3.0
Two case-insensitive comparisons on request-derived usernames outside the main authorization path in CUPS's scheduler (printer ACL validation and private-attribute filtering) could allow bypass of username-based access controls in certain configurations.
Products: Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Debian 12 | cups | no fix |
| Debian 13 | cups | no fix |
| Debian 14 | cups | no fix |
| Red Hat hummingbird 1 | cups | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-client | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-devel | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-filesystem | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-ipptool | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-libs | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-lpd | 0:2.4.19-4.2.hum1 |
| Red Hat hummingbird 1 | cups-printerapp | 0:2.4.19-4.2.hum1 |
| Ubuntu 22.04 LTS | cups | no fix |
| Ubuntu 24.04 LTS | cups | no fix |
| Ubuntu 26.04 LTS | cups | no fix |
| Ubuntu 26.10 | cups | no fix |
| Ubuntu Pro 16.04 LTS | cups | no fix |
| Ubuntu Pro 18.04 LTS | cups | no fix |
| Ubuntu Pro 20.04 LTS | cups | no fix |
| openSUSE Tumbleweed | cups | 2.4.20-1.1 |