Input validation error in konsole - CVE-2025-49091
Published: June 9, 2025
Vulnerability identifier: #VU110673
CSH Severity: Critical
CVSS v4: 7.5 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-49091
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to compromise the affected system.
The vulnerability exists due to insufficient validation of telnet://URL scheme. A remote attacker can trick the victim into clicking on a specially crafted URL and execute arbitrary console commands on the system with privileges of the current user.
The vulnerability affects installations without telnet client installed.
Affected software
konsole
Arch Linux
Gentoo Linux
Debian Linux
Fedora
konsole (Red Hat package)
konsole5
konsole (Debian package)
kde-apps/konsole
konsole
Arch Linux
Gentoo Linux
Debian Linux
Fedora
konsole (Red Hat package)
konsole5
konsole (Debian package)
kde-apps/konsole
konsole
How to mitigate CVE-2025-49091
Install updates from vendor's website.
As a temporary solution you can install the telnet client, or delete the file:
/usr/share/applications/ktelnetservice6.desktop
konsole - update to 25.04.2
konsole (Red Hat package) - update to 4.10.5-5.el7_9.1
konsole5 - addressed in versions 22.04.1-2.el8, 23.08.5-2.el9
konsole (Debian package) - update to 4:22.12.3-1+deb12u1
kde-apps/konsole - update to 24.12.3-r1
konsole - update to 25.04.2-1
konsole (Red Hat package) - update to 4.10.5-5.el7_9.1
konsole5 - addressed in versions 22.04.1-2.el8, 23.08.5-2.el9
konsole (Debian package) - update to 4:22.12.3-1+deb12u1
kde-apps/konsole - update to 24.12.3-r1
konsole - update to 25.04.2-1