CVE-2026-91838

HIGH 7.8

Networkmanager-sstp: networkmanager-sstp: local privilege escalation to root via shell injection in vpn profile fields

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-78
Vendor	gnome
Product	networkmanager-sstp
Published	Sep 25, 2026
Last Updated	Sep 25, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

GNOME / NetworkManager-sstp

0 < *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-91838 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2533637 gitlab.gnome.org: https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67

Credits

Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue.