CVE-2026-91839 Details
Description
A flaw was found in NetworkManager-fortisslvpn, the FortiSSLVPN plugin for NetworkManager. The nm-fortisslvpn-service improperly handles carriage-return/line-feed (CR/LF) characters in VPN connection profile credentials. A local unprivileged user can exploit this by crafting a malicious VPN profile to inject additional configuration directives. This can lead to arbitrary code execution with root privileges when the crafted VPN connection is activated.
A vulnerability exists in the NetworkManager FortiSSLVPN plugin, specifically in the nm-fortisslvpn-service component. This vulnerability arises from improper handling of carriage-return/line-feed (CR/LF) characters in VPN connection profile credentials. A local, unprivileged user can exploit this flaw by creating a malicious VPN profile that injects additional configuration directives. When the compromised VPN connection is activated, it can result in arbitrary code execution with root privileges.
If the NetworkManager FortiSSLVPN plugin is not needed, it is recommended to remove the NetworkManager-fortisslvpn package. This can be done using the package manager command 'sudo dnf remove NetworkManager-fortisslvpn'. After removal, a system restart may be required for the changes to take effect.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Sep 25, 2026CISA-ADP
Assessed Sep 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-91839 | [email protected] | AdvisoryRemedyVendor |
| https://bugzilla.redhat.com/show_bug.cgi?id=2533640 | [email protected] | Issue TrackingTechnical DescriptionVendor |
| https://gitlab.gnome.org/Archive/NetworkManager-fortisslvpn/-/work_items/80 | [email protected] | ExploitTechnical AnalysisVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-93 | Improper Neutralization of CRLF Sequences ('CRLF Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| NetworkManager-fortisslvpn | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Sep 28, 2026 | CVE Modified | CISA-ADP |
| Sep 26, 2026 | CVE Modified | CISA-ADP |
| Sep 25, 2026 | CVE Modified | CISA-ADP |
| Sep 25, 2026 | New CVE Received | [email protected] |