High severity · published Oct 13, 2026
CVE-2026-88964
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…
7.1
CVSS
0.4%
EPSS
No
On KEV
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
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 32% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenVPN · OpenVPN
2.7_alpha3 through 2.7.7 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-88964
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-88964
vendor-advisory
https://community.openvpn.net/Security%20Announcements/CVE-2026-88964
More from OpenVPN
9.8
CVE-2024-27903
OpenVPN plug-ins on Windows with OpenVPN 2.6.9 and earlier could be loaded from any directory, which allows an attacker to load an arbitrary plug-in which can be used to interact…
9.8
CVE-2023-46850
Use after free in OpenVPN version 2.6.0 to 2.6.6 may lead to undefined behavoir, leaking memory buffers or remote execution when sending network buffers to a remote peer
9.8
CVE-2022-0547
OpenVPN 2.1 until v2.4.12 and v2.5.6 may enable authentication bypass in external authentication plug-ins when more than one of them makes use of deferred authentication replies,…
9.8
CVE-2017-12166
OpenVPN versions before 2.3.3 and 2.4.x before 2.4.4 are vulnerable to a buffer overflow vulnerability when key-method 1 is used, possibly resulting in code execution
9.1
CVE-2026-13379
The Windows interactive service in OpenVPN 2.7_alpha1 through 2.7.4 allows remote attackers to cause persistent DNS state pollution or a service crash via a crafted search domain…