openvpn: OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in...
CVE-2026-11771 is fixed in 5 products on 1 platform, first by DEBIAN-CVE-2026-11771, released July 4, 2026. It is not reported as exploited. Patch Radar priority: High.
OpenVPN version 2.1.0 through 2.6.20 and 2.7_alpha1 through 2.7.4 allows attackers via an off-by-one buffer write in the NTLM proxy authentication to potentially cause a crash via a crafted NTLM response from a malicious proxy server
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| openvpn · Debian 12.15 (bookworm) | 2.6.14-0+deb12u2 | DEBIAN-CVE-2026-11771 | Jul 4, 2026 |
| openvpn · Debian 13.5 (trixie) | 2.6.14-1+deb13u3 | DEBIAN-CVE-2026-11771 | Jul 4, 2026 |
| openvpn · Debian 14 | 2.7.5-1 | DEBIAN-CVE-2026-11771 | Jul 4, 2026 |
| openvpn · Ubuntu 24.04.5 LTS (noble) | 2.6.19-0ubuntu0.24.04.3 | openvpn 2.6.19-0ubuntu0.24.04.3 | Jul 18, 2026 |
| openvpn · Ubuntu 26.04.1 LTS (resolute) | 2.7.0-1ubuntu1.2 | openvpn 2.7.0-1ubuntu1.2 | Jul 6, 2026 |
| openvpn · amzn 2023 | 2.6.12-1.amzn2023.0.5 | ALAS2023-2026-1990 | Jul 20, 2026 |
| openvpn · opensuse-leap 16.0 | 2.6.10-160000.5.1 | OPENSUSE-SU-2026:22072-1 | Nov 7, 2026 |
| openvpn · sles 15.6 | 2.6.10-150600.3.26.1 | SUSE-SU-2026:3596-1 | Aug 12, 2026 |
| openvpn · sles 15.7 | 2.6.10-150600.3.26.1 | SUSE-SU-2026:3596-1 | Aug 12, 2026 |
| openvpn · sles 16.0 | 2.6.10-160000.5.1 | SUSE-SU-2026:24220-1 | Nov 7, 2026 |
| openvpn-dco · sles 15.6 | 2.6.10-150600.3.26.1 | SUSE-SU-2026:3596-1 | Aug 12, 2026 |
| openvpn-dco · sles 15.7 | 2.6.10-150600.3.26.1 | SUSE-SU-2026:3596-1 | Aug 12, 2026 |
| openvpn-debuginfo · amzn 2023 | 2.6.12-1.amzn2023.0.5 | ALAS2023-2026-1990 | Jul 20, 2026 |
| openvpn-debugsource · amzn 2023 | 2.6.12-1.amzn2023.0.5 | ALAS2023-2026-1990 | Jul 20, 2026 |
| openvpn-devel · amzn 2023 | 2.6.12-1.amzn2023.0.5 | ALAS2023-2026-1990 | Jul 20, 2026 |
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