# CVE-2026-11604 - Windows kernel heap corruption via max epoch fast-forward in receive-key generation
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TBD
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An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).
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ovpn-dco-win driver for Windows version 2.0.0 through 2.8.2 are affected. This is fixed in version 2.8.3.
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A fixed driver is contained in OpenVPN Windows installer packages for 2.7.4-I002.
