CVE-2026-35058 Denial of service in OpenVPN
Authenticated attackers can cause a denial of service in OpenVPN by sending specially crafted packets that trigger a fatal assertion during key extraction.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-35058?
CVE-2026-35058 is a medium-severity denial of service vulnerability in OpenVPN, published on 8 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Improper validation of packet length during tls-crypt-v2 key extraction in OpenVPN 2.6.0 through 2.6.19 and 2.7_alpha1 through 2.7.1 allows authenticated attackers to trigger a fatal assertion and cause a denial of service via a specially crafted packet.
Weakness: CWE-617
Which versions are affected by CVE-2026-35058?
It affects 1 product.
Products include Openvpn Openvpn.
How do I fix CVE-2026-35058?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-35058 being exploited?
There is no known exploitation of CVE-2026-35058 in the wild and no public exploit code.
Other vulnerabilities in OpenVPN
Sources
Also known as ALPINE-CVE-2026-35058, DEBIAN-CVE-2026-35058, GHSA-22j3-3q48-2rmj, UBUNTU-CVE-2026-35058.