CVE-2026-27447

Publication date 3 April 2026

Last updated 8 June 2026

Ubuntu priority

Cvss 3 Severity Score

Description

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
cups	26.04 LTS resolute	Fixed 2.4.16-1ubuntu1.2
	25.10 questing	Fixed 2.4.12-0ubuntu3.9
	24.04 LTS noble	Fixed 2.4.7-1.2ubuntu7.13
	22.04 LTS jammy	Fixed 2.4.1op1-1ubuntu4.20
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
cups	Upstream: a0c62c1 Upstream: 6d97ee3 Upstream: 849fba7 Upstream: 88516bf

Severity score breakdown

Parameter	Value
Base score	4.8 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	High
User interaction	Required
Scope	Unchanged
Confidentiality	High
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:H/I:L/A:N

References

Related Ubuntu Security Notices (USN)

USN-8405-1
CUPS vulnerabilities
8 June 2026