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Vulnerability record · CVE-2026-91840 · published 25 September 2026

CVE-2026-91840: A flaw was found in NetworkManager-vpnc.

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.

7.8 CVSS 3.1 High EPSS 0.19% · top 91.9% CWE-93 · CWE-93 Received
7.8CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
26 Sep 2026Last modified by NVD

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.

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-91840), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.