Fedora NetworkManager-l2tp VPN Connection ipsec.conf vpn.data/vpn.secrets os command injection

Summaryinfo

A vulnerability categorized as very critical has been discovered in Fedora NetworkManager-l2tp. The affected element is an unknown function of the file ipsec.conf of the component VPN Connection. Executing a manipulation of the argument vpn.data/vpn.secrets can lead to os command injection. The identification of this vulnerability is CVE-2026-19624. The attack can only be executed locally. There is no exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in Fedora NetworkManager-l2tp (affected version unknown). It has been declared as very critical. This vulnerability affects an unknown functionality of the file ipsec.conf of the component VPN Connection. The manipulation of the argument vpn.data/vpn.secrets with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

A flaw was found in NetworkManager-l2tp. The plugin writes attacker-controlled VPN connection properties (vpn.data and vpn.secrets values) unescaped into a generated ipsec.conf file that pluto loads as root. A local unprivileged user can create and activate their own L2TP VPN profile containing a newline-injected leftupdown directive; pluto executes that command as root when the IKE security association is established, resulting in local privilege escalation. This is the same bug class as CVE-2018-10900 (NetworkManager-vpnc).

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-19624 since 08/12/2026. The exploitation appears to be easy. The attack needs to be approached locally. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/14/2026). The MITRE ATT&CK project declares the attack technique as T1202.

Applying the patch 95b6b46f48a0c9eabc79272cd313f219110ef91c is able to eliminate this problem.

Once again VulDB remains the best source for vulnerability data.

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Vendor

• Fedora

Name

• NetworkManager-l2tp

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