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| edf3eb | uddr | 2026-09-23 14:53:21 | 1 | # CVE-2026-84471 - Possible double-free in check_session_buf_not_used() lame duck handling |
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| 3 | OpenVPN 2.x allows attackers to potentially cause a double-free of a TLS session buffer in the lame duck case, because the guard in `check_session_buf_not_used()` was incomplete. This extends the earlier fix for CVE-2026-13117. |
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| 5 | OpenVPN version 2.6.0 through 2.6.22 and 2.7_alpha1 through 2.7.6 are affected. This is fixed in versions 2.6.23 and 2.7.7. |
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| 7 | CVE Record: [CVE-2026-84471](https://www.cve.org/CVERecord?id=CVE-2026-84471) |
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| 9 | Github: |
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| 10 | * [OpenVPN/openvpn-private-issues#157](https://github.com/OpenVPN/openvpn-private-issues/issues/157) |
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| 11 | * [OpenVPN/openvpn-private-issues#132](https://github.com/OpenVPN/openvpn-private-issues/issues/132) |
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| 13 | Release notes: |
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| 14 | * [openvpn-2.7.7](https://community.openvpn.net/ReleaseHistory#openvpn-277-released-3-september-2026) |
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| 15 | * [openvpn-2.6.23](https://community.openvpn.net/ReleaseHistory#openvpn-2623-released-23-september-2026) |
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| 17 | Reported-By: Andreas Gabriel Berbescu, and Haruki Oyama (Waseda University) |