CVE-2026-91838
highA flaw was found in NetworkManager-sstp, the SSTP VPN plugin for NetworkManager.
A flaw was found in NetworkManager-sstp, the SSTP VPN plugin for NetworkManager. A local unprivileged user can exploit this vulnerability by embedding special characters, known as shell metacharacters, into VPN connection profile fields such as CA certificate or proxy settings. These unescaped characters are then processed by the `pppd` daemon, which runs with root privileges, allowing the attacker to execute arbitrary commands with elevated permissions when a malicious VPN connection is activated.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://access.redhat.com/security/cve/CVE-2026-91838 patrick@puiterwijk.org
- https://bugzilla.redhat.com/show_bug.cgi?id=2533637 patrick@puiterwijk.org
- https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67 patrick@puiterwijk.org
- https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67 134c704f-9b21-4f2e-91b3-4a467353bcc0