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| 38046b | uddr | 2026-09-03 15:40:44 | 1 | # CVE-2026-81738 - Windows single-byte overflow in write_dhcp_search_str() temp buffer |
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| 3 | OpenVPN 2.x on Windows allows attackers to overflow a temporary buffer by a single byte via suitably crafted DHCP options, due to an off-by-one in the buffer guard in `write_dhcp_search_str()`. |
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| 5 | OpenVPN version 2.5.0 through 2.7.6 are affected. This is fixed in version 2.7.7. |
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| 7 | CVE Record: [CVE-2026-81738](https://www.cve.org/CVERecord?id=CVE-2026-81738) |
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| 9 | Github: |
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| 10 | * [OpenVPN/openvpn-private-issues#165](https://github.com/OpenVPN/openvpn-private-issues/issues/165) |
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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: Andre Kropp (Nexory) and ChinhNguyen |