CVE-2026-91839 Command injection in NetworkManager-fortisslvpn
Local attackers can escalate privileges to root by injecting CRLF characters into VPN profile credentials, leading to arbitrary code execution.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-91839?
CVE-2026-91839 is a high-severity command injection vulnerability in GNOME NetworkManager-fortisslvpn, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-93
Which versions are affected by CVE-2026-91839?
How do I fix CVE-2026-91839?
No fix has been published for CVE-2026-91839 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-91839 being exploited?
There is no known exploitation of CVE-2026-91839 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-91839, GHSA-vr82-qjvf-9rrq, UBUNTU-CVE-2026-91839.