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Vulnerability record · CVE-2026-91838 · published 25 September 2026

CVE-2026-91838: OS command injection vulnerability

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.

7.8 CVSS 3.1 High EPSS 0.10% · top 99.2% CWE-78 · OS command injection Received
7.8CVSS 3.1 base score
0.10%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
25 Sep 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-91838), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.