{"id":"CVE-2026-6676","aliases":["EUVD-2026-36631","GHSA-c89p-wq36-89h3"],"status":"published","title":"Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive","description":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","severity":{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00122,"percentile":0.01973,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-787"],"published":"2026-06-12T22:16:27Z","modified":"2026-07-23T09:10:00Z","products":[{"vendor":"avira","product":"avira antivirus"},{"vendor":"gen digital","product":"avira antivirus"}],"references":[{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6676"},{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories"},{"url":"https://github.com/advisories/GHSA-c89p-wq36-89h3"}],"sources":{"cve":[{"id":"CVE-2026-6676","title":"Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive","description":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","status":"published","published":"2026-06-12T22:16:27.745Z","modified":"2026-06-15T18:01:27.224Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"cna"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T13:49:53.818886Z"}],"euvd":[{"id":"EUVD-2026-36631","description":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","status":"published","published":"2026-06-12T22:16:27Z","modified":"2026-06-15T18:01:27Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T18:20:41.888684Z"}],"ghsa":[{"id":"GHSA-c89p-wq36-89h3","title":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed...","description":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","status":"published","published":"2026-06-13T00:34:33Z","modified":"2026-06-13T00:34:40Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:08:45.788743Z"}],"nvd":[{"id":"CVE-2026-6676","description":"Heap buffer out-of-bounds write vulnerability in Avira Antivirus engine when scanning a malformed POSIX tar archive may allow Local Execution of Code or Denial-of-Service of the antivirus engine process.\n\nThis issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.","status":"published","published":"2026-06-12T23:16:45.007Z","modified":"2026-07-23T09:10:00.113Z","cvss":[{"version":"3.1","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:12:23.846948Z"}]}}