CVE-2026-81738 Memory corruption in OpenVPN
Attackers can trigger an out-of-bounds write in the OpenVPN Windows driver via crafted domain search entries, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-81738?
CVE-2026-81738 is a low-severity memory corruption vulnerability in OpenVPN, published on 7 Sep 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
OpenVPN 2.5.0 through 2.7.6 on Windows using the tap-windows6 driver allows attackers to trigger an out-of-bounds write via crafted DOMAIN-SEARCH entries
Which versions are affected by CVE-2026-81738?
How do I fix CVE-2026-81738?
No fix has been published for CVE-2026-81738 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-81738 being exploited?
There is no known exploitation of CVE-2026-81738 in the wild and no public exploit code.
Sources
Also known as GHSA-7xfh-h474-9hf7.