Local Privileged Escalation in NetworkManagerfortisslvpn via CR/LF Injection
CVE-2026-91839 Published on September 25, 2026
Networkmanager-fortisslvpn: networkmanager-fortisslvpn: local privilege escalation to root via crlf injection in vpn profile credentials
A flaw was found in NetworkManager-fortisslvpn, the FortiSSLVPN plugin for NetworkManager. The nm-fortisslvpn-service improperly handles carriage-return/line-feed (CR/LF) characters in VPN connection profile credentials. A local unprivileged user can exploit this by crafting a malicious VPN profile to inject additional configuration directives. This can lead to arbitrary code execution with root privileges when the crafted VPN connection is activated.
Vulnerability Analysis
CVE-2026-91839 can be exploited with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. Public availability of a proof of concept (POC) exploit exists for CVE-2026-91839. The potential impact of an exploit of this vulnerability is considered to be very high.
Timeline
Reported to Red Hat.
Made public.
Weakness Type
What is a CRLF Injection Vulnerability?
The software uses CRLF (carriage return line feeds) as a special element, e.g. to separate lines or records, but it does not neutralize or incorrectly neutralizes CRLF sequences from inputs.
CVE-2026-91839 has been classified to as a CRLF Injection vulnerability or weakness.
Products Associated with CVE-2026-91839
Want to know whenever a new CVE is published for GNOME Networkmanager? stack.watch will email you.
Affected Versions
GNOME NetworkManager-fortisslvpn:- Before * is affected.