CVE-2026-27447
OpenPrinting CUPS: Authorization bypass via case-insensitive group-member lookup
CVE-2026-27447 is fixed in 26 products on 1 platform, first by DEBIAN-CVE-2026-27447, released April 3, 2026. It is not reported as exploited. Patch Radar priority: Routine.
Routine
CVSS
6.3
Moderate
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0030
22nd percentile
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| cups · Debian 14 | 2.4.17-1 | DEBIAN-CVE-2026-27447 | Apr 3, 2026 |
| cups · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups · sles 15.7 | 2.2.7-150000.3.93.1 | SUSE-SU-2026:2732-1 | Jul 2, 2026 |
| cups-bsd · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-bsd 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-bsd · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-bsd 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-bsd · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-bsd 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-bsd · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-bsd 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-client · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-client 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-client · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-client 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-client · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-client 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-client · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-client 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-client · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-client-debuginfo · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-common · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-common 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-common · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-common 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-common · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-common 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-common · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-common 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-core-drivers · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-core-drivers 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-core-drivers · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-core-drivers 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-core-drivers · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-core-drivers 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-core-drivers · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-core-drivers 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-daemon · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-daemon 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-daemon · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-daemon 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-daemon · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-daemon 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-daemon · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-daemon 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-debuginfo · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-debugsource · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-devel · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-filesystem · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-ipp-utils · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-ipp-utils 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-ipp-utils · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-ipp-utils 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-ipp-utils · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-ipp-utils 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-ipp-utils · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-ipp-utils 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-ipptool · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-ipptool-debuginfo · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-libs · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-libs-debuginfo · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-lpd · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-lpd-debuginfo · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-ppdc · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-ppdc 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-ppdc · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-ppdc 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-ppdc · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-ppdc 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-ppdc · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-ppdc 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| cups-printerapp · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-printerapp-debuginfo · amzn 2023 | 1:2.4.19-1.amzn2023.0.1 | ALAS2023-2026-1668 | May 11, 2026 |
| cups-server-common · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | cups-server-common 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| cups-server-common · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | cups-server-common 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| cups-server-common · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | cups-server-common 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| cups-server-common · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | cups-server-common 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| libcups2 · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | libcups2 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| libcups2t64 · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | libcups2t64 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| libcups2t64 · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | libcups2t64 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| libcups2t64 · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | libcups2t64 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
| libcupsimage2 · Ubuntu 22.04.1 LTS (jammy) | 2.4.1op1-1ubuntu4.20 | libcupsimage2 2.4.1op1-1ubuntu4.20 | Apr 24, 2026 |
| libcupsimage2t64 · Ubuntu 24.04.5 LTS (noble) | 2.4.7-1.2ubuntu7.13 | libcupsimage2t64 2.4.7-1.2ubuntu7.13 | Apr 24, 2026 |
| libcupsimage2t64 · Ubuntu 25.10 (questing) | 2.4.12-0ubuntu3.9 | libcupsimage2t64 2.4.12-0ubuntu3.9 | Apr 24, 2026 |
| libcupsimage2t64 · Ubuntu 26.04.1 LTS (resolute) | 2.4.16-1ubuntu1.2 | libcupsimage2t64 2.4.16-1ubuntu1.2 | Apr 24, 2026 |
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