Vulnerability · Published Sep 7, 2026 · Assigned by OpenVPN
CVE-2026-81738
Low 2.3
In plain English
A low-severity stack buffer overflow in OpenVPN from OpenVPN. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).
Severity (CVSS 4.0)2.3Low
Exploit odds (30 days)0.3%top 73.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu:22.04:LTS | openvpn | no fix listed | UBUNTU-CVE-2026-81738 |
| Ubuntu:24.04:LTS | openvpn | no fix listed | UBUNTU-CVE-2026-81738 |
| Ubuntu:26.04:LTS | openvpn | no fix listed | UBUNTU-CVE-2026-81738 |
Affected products (as reported)
Weakness: CWE-121, CWE-193, CWE-787 · Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:L/VA:L/SC:N/SI:L/SA:L