{"id":"CVE-2026-11604","details":"An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).","modified":"2026-07-08T08:04:54.482008258Z","published":"2026-06-10T21:04:37.141Z","database_specific":{"cwe_ids":["CWE-122","CWE-131","CWE-787"],"cna_assigner":"OpenVPN","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11604.json","unresolved_ranges":[{"extracted_events":[{"introduced":"2.0.0"},{"last_affected":"2.5.8"}],"source":"AFFECTED_FIELD"}]},"references":[{"type":"ADVISORY","url":"https://community.openvpn.net/Security%20Announcements/CVE-2026-11604"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/11xxx/CVE-2026-11604.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-11604"},{"type":"PACKAGE","url":"https://github.com/OpenVPN/ovpn-dco-win/releases"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/openvpn/ovpn-dco-win","events":[{"introduced":"0"},{"fixed":"435b881caab4e4303a23eb00b373eee3caf37903"}],"database_specific":{"extracted_events":[{"introduced":"2.0.0"},{"fixed":"2.8.3"}],"source":"DESCRIPTION"}}],"versions":["2.8.2","2.8.0","2.7.1","2.7.0","2.6.2","2.6.1","2.5.9","2.5.6","2.5.5","2.5.4","2.5.3","2.5.2","2.5.1","2.5.0","1.0.0","0.9.4","0.9.3","0.9.2","0.9.1","0.9.0","0.8.3","0.8.2","0.8.1","0.8.0","0.7.6","0.7.4","0.7.1","0.6.8","0.6.7","0.6.5"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-11604.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H"}]}