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| 1038d1 | uddr | 2026-09-03 15:39:22 | 1 | # CVE-2026-78221 - Windows openvpnserv buffer overread via UTF8 IDN NRPT domains |
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| 3 | OpenVPN 2.x on Windows allows attackers to achieve a buffer overread in `openvpnserv` because an incorrect NRPT domains size was passed on, which becomes visible when IDN domains with UTF8 encoding are involved. |
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| 5 | OpenVPN version 2.7_alpha1 through 2.7.6 are affected. This is fixed in version 2.7.7. |
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| 7 | CVE Record: [CVE-2026-78221](https://www.cve.org/CVERecord?id=CVE-2026-78221) |
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| 9 | Github: |
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| 10 | * [OpenVPN/openvpn-private-issues#162](https://github.com/OpenVPN/openvpn-private-issues/issues/162) |
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| 12 | Release notes: |
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| 13 | * [openvpn-2.7.7](https://community.openvpn.net/ReleaseHistory#openvpn-277-released-3-september-2026) |
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| 15 | Reported-By: BreachX Zero Day Labs (using Typhon AI Mil v2) |