CVE-2026-91840

HIGH 7.8

Networkmanager-vpnc: networkmanager-vpnc: local privilege escalation to root via newline injection in vpn username

CVSS Score

7.8

EPSS Score

0.0%

EPSS Percentile

0th

A flaw was found in NetworkManager-vpnc. This vulnerability allows a local unprivileged user to escalate privileges to root. By injecting a newline character into the VPN username field, an attacker can manipulate the vpnc configuration to execute an arbitrary program with root privileges when the malicious VPN connection is activated.

CWE	CWE-93
Vendor	gnome
Product	networkmanager-vpnc
Published	Sep 25, 2026
Last Updated	Sep 25, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

GNOME / NetworkManager-vpnc

0 < *

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-91840 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2533642 gitlab.gnome.org: https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19

Credits

Red Hat would like to thank Andreas Gabriel Berbescu for reporting this issue.