Vulnerability · Published Jun 12, 2026 · Assigned by GEN
CVE-2026-6676Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
High 7.8
In plain English
A high-severity out-of-bounds write in Avira Antivirus from Gen Digital. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 2% of all known vulnerabilities).
Severity (CVSS 3.1)7.8High
Exploit odds (30 days)0.1%top 98.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Gen Digital | Avira Antivirus | 0 – before 8.3.27.12 |
Weakness: CWE-787 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H