{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-6676", "assignerOrgId": "dbd8429d-f261-4b1e-94cc-ae3132817e2e", "state": "PUBLISHED", "assignerShortName": "GEN", "dateReserved": "2026-04-20T14:46:06.355Z", "datePublished": "2026-06-12T22:16:27.745Z", "dateUpdated": "2026-06-12T22:16:27.745Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "dbd8429d-f261-4b1e-94cc-ae3132817e2e", "shortName": "GEN", "dateUpdated": "2026-06-12T22:16:27.745Z"}, "title": "Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive", "datePublic": "2026-02-26T11:42:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-787", "description": "CWE-787 Out-of-bounds Write", "type": "CWE"}]}], "impacts": [{"capecId": "CAPEC-549", "descriptions": [{"lang": "en", "value": "CAPEC-549 Local Execution of Code"}]}], "affected": [{"vendor": "Gen Digital", "product": "Avira Antivirus", "platforms": ["Windows", "macOS", "Linux"], "versions": [{"status": "affected", "version": "0", "lessThan": "8.3.27.12", "versionType": "custom"}], "defaultStatus": "affected"}], "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.", "supportingMedia": [{"type": "text/html", "base64": false, "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>"}]}], "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"}}], "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"}}}}

{}

{"cveTags": [], "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."}], "id": "CVE-2026-6676", "lastModified": "2026-06-12T23:16:45.007", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "security@nortonlifelock.com", "type": "Secondary"}]}, "published": "2026-06-12T23:16:45.007", "references": [{"source": "security@nortonlifelock.com", "url": "https://www.gendigital.com/us/en/contact-us/security-advisories/"}], "sourceIdentifier": "security@nortonlifelock.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "security@nortonlifelock.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": ["windows", "macos", "linux"], "status": "affected", "versions": {"scheme": "generic", "value": "[0,8.3.27.12)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "Avira Antivirus", "source": "cna", "vendor": "Gen Digital"}, "product": "avira_antivirus", "vendor": "gen_digital"}], "created": "2026-06-13T01:00:06.800609+00:00", "updated": "2026-06-13T12:29:17.022115+00:00", "vendors": ["gen_digital", "gen_digital$PRODUCT$avira_antivirus"]}