CVE-2026-91838

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

Published: Sep 25, 2026Updated: Sep 25, 2026 Sources: CVE List NVDCWE-78

7.8HIGH

Description

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-78

Affected Products

GNOME

oss-project·USaka gnome project, glib

NetworkManager-sstpOn-prem

Consumer Software / productivity

Exploitability

Workaround Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Execution

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References

https://access.redhat.com/security/cve/CVE-2026-91838

access.redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2533637

bugzilla.redhat.com

https://gitlab.gnome.org/GNOME/network-manager-sstp/-/work_items/67

gitlab.gnome.org

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