CVE-2026-91840

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

State: Published
Severity: 7.8 High
Published: Sep 25, 2026
Updated: Sep 28, 2026
Reserved: Sep 15, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	fedora

Weaknesses

CWE-93 Improper Neutralization of CRLF Sequences ('CRLF Injection')

Affected Products

Product	Versions
NetworkManager-vpncGNOME	all versionsAffected

References

https://access.redhat.com/security/cve/CVE-2026-91840vdb-entry
RHBZ#2533642issue-tracking
https://gitlab.gnome.org/Archive/NetworkManager-vpnc/-/work_items/19

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