Blame
| d72ecc | uddr | 2026-09-03 15:49:08 | 1 | # CVE-2026-84256 - Windows CreateProcess() command line quoting bypass via cmd.exe metacharacters |
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| 3 | OpenVPN 2.x on Windows does not correctly quote command lines passed to `CreateProcess()` for characters that are special to `cmd.exe`. In combination with a validation script and a rogue CA, this could be used to make OpenVPN misbehave. |
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| 5 | OpenVPN version 2.1_rc10 through 2.6.22 and 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-2026-84256](https://www.cve.org/CVERecord?id=CVE-2026-84256) |
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| 9 | Github: |
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| 10 | * [OpenVPN/openvpn-private-issues#159](https://github.com/OpenVPN/openvpn-private-issues/issues/159) |
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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: Clouditera Security |