{"api_version":"1","generated_at":"2026-06-14T18:24:07+00:00","cve":"CVE-2026-6676","urls":{"html":"https://cve.report/CVE-2026-6676","api":"https://cve.report/api/cve/CVE-2026-6676.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-6676","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-6676"},"summary":{"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.","state":"PUBLISHED","assigner":"GEN","published_at":"2026-06-12 23:16:45","updated_at":"2026-06-12 23:16:45"},"problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":[{"version":"3.1","source":"security@nortonlifelock.com","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"}},{"version":"3.1","source":"CNA","type":"CVSS","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","data":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"}}],"references":[{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/","name":"https://www.gendigital.com/us/en/contact-us/security-advisories/","refsource":"security@nortonlifelock.com","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-6676","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-6676","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Gen Digital","product":"Avira Antivirus","version":"affected 8.3.27.12 custom","platforms":["Windows","macOS","Linux"]}],"timeline":[],"solutions":[{"source":"CNA","title":"","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.","time":"","lang":"en"}],"workarounds":[],"exploits":[],"credits":[{"source":"CNA","value":"Mike Zhang, an independent security researcher","lang":"en"}],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"6676","cve":"CVE-2026-6676","epss":"0.000150000","percentile":"0.032000000","score_date":"2026-06-13","updated_at":"2026-06-14 00:08:31"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"affected","platforms":["Windows","macOS","Linux"],"product":"Avira Antivirus","vendor":"Gen Digital","versions":[{"lessThan":"8.3.27.12","status":"affected","version":"0","versionType":"custom"}]}],"credits":[{"lang":"en","type":"reporter","value":"Mike Zhang, an independent security researcher"}],"datePublic":"2026-02-26T11:42:00.000Z","descriptions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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.<p>This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.</p>"}],"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."}],"impacts":[{"capecId":"CAPEC-549","descriptions":[{"lang":"en","value":"CAPEC-549 Local Execution of Code"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"LOCAL","availabilityImpact":"HIGH","baseScore":7.8,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-787","description":"CWE-787 Out-of-bounds Write","lang":"en","type":"CWE"}]}],"providerMetadata":{"dateUpdated":"2026-06-12T22:16:27.745Z","orgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","shortName":"GEN"},"references":[{"url":"https://www.gendigital.com/us/en/contact-us/security-advisories/"}],"solutions":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","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."}],"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."}],"source":{"discovery":"EXTERNAL"},"title":"Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive","x_generator":{"engine":"Vulnogram 1.0.2"}}},"cveMetadata":{"assignerOrgId":"dbd8429d-f261-4b1e-94cc-ae3132817e2e","assignerShortName":"GEN","cveId":"CVE-2026-6676","datePublished":"2026-06-12T22:16:27.745Z","dateReserved":"2026-04-20T14:46:06.355Z","dateUpdated":"2026-06-12T22:16:27.745Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-12 23:16:45","lastModifiedDate":"2026-06-12 23:16:45","problem_types":["CWE-787","CWE-787 CWE-787 Out-of-bounds Write"],"metrics":{"cvssMetricV31":[{"source":"security@nortonlifelock.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"6676","Ordinal":"1","Title":"Avira antivirus engine heap buffer OOB write when scanning a mal","CVE":"CVE-2026-6676","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"6676","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Avira antivirus engine heap buffer OOB write when scanning a mal"}]}}}