Vulnerability · Published Oct 13, 2026 · Assigned by OpenVPN
CVE-2026-88964
High 7.1
In plain English
A high-severity out-of-bounds read 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 0.4% (higher than 32% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 4.0)7.1High
Exploit odds (30 days)0.4%top 68.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
An integer underflow in OpenVPN version 2.7_alpha3 through 2.7.7 on Windows and Android allows remote authenticated servers to cause a denial of service or memory disclosure via crafted domain search options
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | openvpn | no fix listed | DEBIAN-CVE-2026-88964 |
| Debian:13 | openvpn | no fix listed | DEBIAN-CVE-2026-88964 |
| Debian:14 | openvpn | 2.7.8-1 | DEBIAN-CVE-2026-88964 |
| Ubuntu:22.04:LTS | openvpn | no fix listed | UBUNTU-CVE-2026-88964 |
| Ubuntu:24.04:LTS | openvpn | no fix listed | UBUNTU-CVE-2026-88964 |
| Ubuntu:26.04:LTS | openvpn | no fix listed | UBUNTU-CVE-2026-88964 |
Affected products (as reported)
Weakness: CWE-191, CWE-125 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N