GNOME NetworkManager SSTP VPN Plugin os command injection

Summaryinfo

A vulnerability was found in GNOME NetworkManager and classified as very critical. Affected by this issue is some unknown functionality of the component SSTP VPN Plugin. The manipulation results in os command injection. This vulnerability is known as CVE-2026-91838. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability classified as very critical has been found in GNOME NetworkManager (the affected version is unknown). Affected is an unknown code of the component SSTP VPN Plugin. The manipulation with an unknown input leads to a os command injection vulnerability. CWE is classifying the issue as CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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 advisory is shared for download at access.redhat.com. This vulnerability is traded as CVE-2026-91838 since 09/15/2026. The exploitability is told to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/25/2026). The MITRE ATT&CK project declares the attack technique as T1202.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• GNOME

Name

• NetworkManager

License

• open-source

Website

• Vendor: https://www.gnome.org/

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