{"id":"UBUNTU-CVE-2026-11771","details":"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","modified":"2026-08-06T22:15:13.302101161Z","published":"2026-07-03T00:00:00Z","related":["USN-8540-1"],"upstream":["CVE-2026-11771"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-11771"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-11771"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8540-1"}],"affected":[{"package":{"name":"openvpn","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/openvpn?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.6.19-0ubuntu0.24.04.3"}]}],"versions":["2.6.5-0ubuntu1","2.6.7-1ubuntu1","2.6.9-1ubuntu2","2.6.9-1ubuntu3","2.6.9-1ubuntu4","2.6.9-1ubuntu4.1","2.6.12-0ubuntu0.24.04.1","2.6.12-0ubuntu0.24.04.3","2.6.14-0ubuntu0.24.04.1","2.6.14-0ubuntu0.24.04.2","2.6.14-0ubuntu0.24.04.3","2.6.19-0ubuntu0.24.04.1","2.6.19-0ubuntu0.24.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openvpn","binary_version":"2.6.19-0ubuntu0.24.04.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json"}},{"package":{"name":"openvpn","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/openvpn?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.13-1ubuntu3","2.6.14-1ubuntu1","2.6.14-2ubuntu1","2.6.14-2ubuntu1.1","2.6.19-0ubuntu0.25.10.1","2.6.19-0ubuntu0.25.10.2"],"ecosystem_specific":{"binaries":[{"binary_version":"2.6.19-0ubuntu0.25.10.2","binary_name":"openvpn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json"}},{"package":{"name":"openvpn","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/openvpn?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.7.0-1ubuntu1.2"}]}],"versions":["2.6.14-2ubuntu1","2.6.15-1ubuntu1","2.7.0~rc5-1ubuntu5","2.7.0~rc6-1ubuntu1","2.7.0-1ubuntu1","2.7.0-1ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"openvpn","binary_version":"2.7.0-1ubuntu1.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-11771.json"}}],"schema_version":"1.8.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}