{"id":"CVE-2026-78221","title":"An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.","summary":"An incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.","severity":"medium","cvss":5.9,"cvssVector":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:H/VI:N/VA:H/SC:H/SI:N/SA:H","cwe":["CWE-131"],"vendor":"OpenVPN","product":"OpenVPN","affected":["OpenVPN >= 2.7_alpha1 <= 2.7.6"],"published":"2026-09-07","updated":"2026-09-08","sourceUpdated":"2026-09-08T19:07:52.113","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78221","references":[{"url":"https://community.openvpn.net/Security%20Announcements/CVE-2026-78221","label":"security@openvpn.net"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78221.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-78221"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-78221"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-78221"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"epss":0.00116,"epssPercentile":0.01826,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-08T14:54:35.321806Z"},"cvssSource":"cna","scores":{"cna":5.9,"vendor":7.5},"ingestedAt":"2026-09-08T15:33:26.975Z","slug":"CVE-2026-78221","body":"## Overview\n\nAn incorrect buffer size calculation in the Windows Interactive Service in OpenVPN 2.7_alpha1 through 2.7.6 allows local authenticated users to cause memory corruption or disclose sensitive information via crafted NRPT inputs.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-07 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-78221.json)","depth":"sunlit","depthScore":32,"depthScoreParts":{"impact":32.5,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}