CVE-2026-6676

Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive

HIGH

7.8

CVSS Score

Published: June 12, 2026 at 10:16 PM UTC

Updated: July 23, 2026 at 07:32 PM UTC

1 product affected across 1 vendorAvira Antivirus

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

SSVC

No known exploit

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. This issue affects Avira Antivirus on Windows, macOS, and Linux for engine builds before 8.3.27.12.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Avira Antivirus · Gen Digital

60%

v < 8.3.27.12

Affected range stops below 8.3.27.12, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (1)

Source: cverecord

https://www.gendigital.com/us/en/contact-us/security-advisories/

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHGEN

Attack Vector: LOCAL
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: HIGH

Vector?

Quick Info

StatusDEFERRED

CWE

CWE-787

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