{"schemaVersion":3,"id":"USN-8540-1","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"openvpn vulnerabilities\n\nIt was discovered that OpenVPN had a 1-byte buffer overrun when handling\nNTLMv2 proxy responses. An attacker could use this issue to cause a denial\nof service or possibly execute arbitrary code. This issue only affected\nUbuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-11771)\n\nIt was discovered that OpenVPN incorrectly handled metadata when extracting\ntls-crypt-v2 client keys. An attacker could possibly use this issue to\nobtain sensitive information. (CVE-2026-12932)\n\nIt was discovered that OpenVPN had a use-after-free in the ack_write_buf\nhandling. An attacker could use this issue to cause OpenVPN to crash,\nresulting in a denial of service, or possibly execute arbitrary code.\n(CVE-2026-12996)\n\nIt was discovered that OpenVPN had a use-after-free in the tls_wrap_reneg\nhandling. An attacker could use this issue to cause OpenVPN to crash,\nresulting in a denial of service, or possibly execute arbitrary code. This\nissue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-13117)\n\nIt was discovered that OpenVPN incorrectly validated authentication tokens\nwhen external authentication was enabled. A remote attacker could possibly\nuse this issue to cause OpenVPN to crash, resulting in a denial of service.\nThis issue only affected Ubuntu 24.04 LTS and Ubuntu 26.04 LTS.\n(CVE-2026-13122)\n\nIt was discovered that OpenVPN had a memory leak when handling tls-crypt-v2\nclient keys. A remote attacker with a valid tls-crypt-v2 client key could\npossibly use this issue to cause OpenVPN to consume excessive resources,\nleading to a denial of service. (CVE-2026-13698)","dates":{"published":"2026-07-14T15:40:18.000Z","modified":"2026-08-06T22:15:14.836Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":null,"severity":"unknown","version":null,"versionLabel":null,"source":null,"vector":null,"computed":false,"selection":"none"},"metrics":[]},"epss":{"probability":null,"percentile":null,"severity":"unknown","asOf":null,"change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[],"last30":[]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[],"affected":[{"vendor":"ubuntu","product":"openvpn","name":"openvpn","label":"openvpn","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/openvpn","purlType":"deb","versions":[{"text":"< 2.5.11-0ubuntu0.22.04.4","noFixRecorded":false,"fixedIn":null},{"text":"< 2.6.19-0ubuntu0.24.04.3","noFixRecorded":false,"fixedIn":null},{"text":"< 2.7.0-1ubuntu1.2","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.5.11-0ubuntu0.22.04.4 | < 2.6.19-0ubuntu0.24.04.3 | < 2.7.0-1ubuntu1.2","eol":{"isEol":null,"eolDate":null,"matchMethod":"name_exact","cycle":null,"product":{"name":"openvpn","label":"OpenVPN","category":"app"}},"hubHref":null}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://ubuntu.com/security/notices/USN-8540-1","label":"ubuntu.com/security/notices/USN-8540-1","hostname":"ubuntu.com","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-11771","label":"ubuntu.com/security/CVE-2026-11771","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-12932","label":"ubuntu.com/security/CVE-2026-12932","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-12996","label":"ubuntu.com/security/CVE-2026-12996","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-13117","label":"ubuntu.com/security/CVE-2026-13117","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-13122","label":"ubuntu.com/security/CVE-2026-13122","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-13698","label":"ubuntu.com/security/CVE-2026-13698","hostname":"ubuntu.com","tags":["REPORT"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":["CVE-2026-11771","CVE-2026-12932","CVE-2026-12996","CVE-2026-13117","CVE-2026-13122","CVE-2026-13698"]},"timeline":[{"kind":"published","date":"2026-07-14T15:40:18.000Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-08-06T22:15:14.836Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":0,"level":"minimal","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-21T09:26:41.789Z","stale":false,"partial":false}}