Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Red Hat | Red Hat Hardened Images | — | — |
| Red Hat | Red Hat Enterprise Linux 10 | — | — |
| Red Hat | Red Hat Enterprise Linux 6 | — | — |
| Red Hat | Red Hat Enterprise Linux 7 | — | — |
| Red Hat | Red Hat Enterprise Linux 8 | — | — |
| Red Hat | Red Hat Enterprise Linux 9 | — | — |
| Red Hat | Red Hat OpenShift Container Platform 4 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | cups | 2.4.20-1 | — |
| Debian 13 | cups | No fix yet | — |
| Debian 12 | cups | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | cups | No fix yet | — |
| Ubuntu 26.04 LTS | cups | No fix yet | — |
| Ubuntu 24.04 LTS | cups | No fix yet | — |
| Ubuntu 22.04 LTS | cups | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | cups | No fix yet | — |
| Ubuntu Pro 18.04 LTS | cups | No fix yet | — |
| Ubuntu Pro 16.04 LTS | cups | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | cups +7 | 1:2.4.19-4.2.hum1 | RHSA-2026:67568 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | cups | 2.4.20-1.1 | openSUSE-SU-2026:12192-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | cups +7 | 1:2.4.20-1.amzn2023.0.1 | ALAS2023-2026-3415 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | cups | No fix yet | — |
Advisories 4
- RHSA-2026:67568 Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALAS2023-2026-3415 Moderate: cups security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Nov 9, 2026
- WID-SEC-2026-3282 CUPS: Mehrere Schwachstellen ermöglichen Offenlegung von Informationen BSI CERT-Bund (WID) · Nov 3, 2026
- openSUSE-SU-2026:12192-1 cups-2.4.20-1.1 on GA media SUSE / openSUSE Security Updates · Oct 21, 2026
References
- RHSA-2026:67568 vendor-advisory
- https://access.redhat.com/security/cve/CVE-2026-87876 vdb-entry
- RHBZ#2530991 issue-tracking
- https://github.com/OpenPrinting/cups/commit/88e67c00c130a45f3a1edf36686f7a0b2982fef8
- https://github.com/OpenPrinting/cups/commit/f56844dbe4a54a9f8e1aeb3b913fbee614156bdb
- https://github.com/OpenPrinting/cups/security/advisories/GHSA-r8jp-q6fh-g5r2