CVE-2026-91838CWE-78command-injection

CVE-2026-91838

High · published September 25, 2026

CVSS v3.1
7.8
EPSS
0%
Percentile
0.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00100 · 0.8th percentile
Weakness
CWE-78 · Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Published
2026-09-25T22:17Z
References (4)
https://access.redhat.com/security/cve/CVE-2026-91838 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2533637 · [email protected]https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67 · [email protected]https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 27 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 25 SEP 17:51Z
    Networkmanager-sstp: networkmanager-sstp: local privilege escalation to root via shell injection in vpn profile fields
    cvelistv5