{"id":"CVE-2026-6676","state":"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.","publishedAt":"2026-06-12T22:16:27.745Z","updatedAt":"2026-06-15T18:01:27.224Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"GEN"},"assigner":"GEN","products":["Gen Digital Avira Antivirus"],"affected":[{"vendor":"Gen Digital","product":"Avira Antivirus","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"8.3.27.12","versionType":"custom"}],"platforms":["Windows","macOS","Linux"]}],"references":["https://www.gendigital.com/us/en/contact-us/security-advisories/"],"weaknesses":["CWE-787"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/6xxx/CVE-2026-6676.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-6676","state":"PUBLISHED","datePublished":"2026-06-12T22:16:27.745Z","dateUpdated":"2026-06-15T18:01:27.224Z","assignerShortName":"GEN","assignerOrgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","dateReserved":"2026-04-20T14:46:06.355Z"},"containers":{"cna":{"title":"Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Gen Digital","product":"Avira Antivirus","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"8.3.27.12","versionType":"custom"}],"platforms":["Windows","macOS","Linux"]}],"references":[{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/"}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"version":"3.1","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","baseSeverity":"HIGH","baseScore":7.8,"vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","lang":"en","description":"CWE-787 Out-of-bounds Write","type":"CWE"}]}],"providerMetadata":{"shortName":"GEN","orgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","dateUpdated":"2026-06-12T22:16:27.745Z"},"datePublic":"2026-02-26T11:42:00.000Z","impacts":[{"capecId":"CAPEC-549","descriptions":[{"lang":"en","value":"CAPEC-549 Local Execution of Code"}]}],"solutions":[{"lang":"en","value":"Upgrade to Avira scan engine build 8.3.27.12 or any later engine release. Builds at or above 8.3.27.12 include the fix.","supportingMedia":[{"type":"text/html","base64":false,"value":"Upgrade to Avira scan engine build <strong>8.3.27.12</strong> or <strong>any later</strong> engine release. Builds at or above 8.3.27.12 include the fix."}]}],"credits":[{"lang":"en","value":"Mike Zhang, an independent security researcher","type":"reporter"}],"source":{"discovery":"EXTERNAL"},"x_generator":{"engine":"Vulnogram 1.0.2"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-15T17:35:52.739611Z","id":"CVE-2026-6676","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-06-15T18:01:27.224Z"}}]}}}