CVE-2026-91840

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

7.8 High

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.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.19%Unchanged since Sep 26, 2026

What each source reports

CVE List Score used 7.8

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

Record: CVE-2026-91840
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-93
Updated: 2026-11-02

EUVDEUVD-2026-87250 7.8

Record: EUVD-2026-87250
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-p2g6-ffcc-pqqv 7.8

A flaw was found in NetworkManager-vpnc. This vulnerability allows a local unprivileged user to...

Record: GHSA-p2g6-ffcc-pqqv
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-93
Updated: 2026-11-02

NVD 7.8

Record: CVE-2026-91840
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-93
Updated: 2026-11-02

OSVDEBIAN-CVE-2026-91840 7.8

Record: DEBIAN-CVE-2026-91840
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2026-91840 7.8

Record: UBUNTU-CVE-2026-91840
CVSS 3.1: 7.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`network-manager-vpnc` Debian:12	All versions, plus listed versions 1.2.8-41.2.8-51.2.8-61.2.8-71.2.8-8 Show 4 moreShow less 1.4.0-11.4.0-21.4.0-31.4.0-4	None known
`network-manager-vpnc` Debian:13	All versions, plus listed versions 1.4.0-21.4.0-31.4.0-4	None known
`network-manager-vpnc` Ubuntu:16.04:LTS	All versions, plus listed versions 0.9.10.0-1ubuntu11.0.8-1ubuntu11.1.93-11.1.93-1ubuntu0.1	None known
`network-manager-vpnc` Ubuntu:18.04:LTS	All versions, plus listed versions 1.2.4-41.2.4-61.2.4-6ubuntu0.1	None known
`network-manager-vpnc` Ubuntu:20.04:LTS	All versions, plus listed versions 1.2.6-2	None known
`network-manager-vpnc` Ubuntu:22.04:LTS	All versions, plus listed versions 1.2.6-31.2.6-41.2.8-2	None known
`network-manager-vpnc` Ubuntu:24.04:LTS	All versions, plus listed versions 1.2.8-51.2.8-71.2.8-7build11.2.8-7build2	None known
`network-manager-vpnc` Ubuntu:26.10	All versions, plus listed versions 1.4.0-3build11.4.0-4	None known
`network-manager-vpnc` Ubuntu:26.04:LTS	All versions, plus listed versions 1.4.0-31.4.0-3build1	None known

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-91840 is a high vulnerability (CVSS 7.8) in [unknown] Networkmanager-vpnc, published September 25, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 9th percentile. No source names a fixed version.