What’s Vulnerable › Vulnerabilities

CVE-2026-91838: Networkmanager-sstp: networkmanager-sstp: local privilege escalation to root via shell injection in vpn profile fields

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-09-30
• Weakness: CWE-78

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.

Affected products

• GNOME NetworkManager-sstp: all versions

References

• 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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