CVE-2026-78221

An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.

  • Published Sep 7, 2026
  • CVSS 5.9 medium
  • 0.1% chance of exploitation in the next 30 days (EPSS)

Affected software

CVE-2026-78221 at the National Vulnerability Database