What’s Vulnerable › Vulnerabilities
CVE-2026-6676: Avira antivirus engine heap buffer OOB write when scanning a malformed POSIX tar archive
- Severity: high (CVSS 7.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-06-12 · updated 2026-07-23
- Weakness: CWE-787
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
- Gen Digital Avira Antivirus: before 8.3.27.12 — fixed in 8.3.27.12
How to fix
Upgrade to a fixed version: Gen Digital Avira Antivirus 8.3.27.12. Check the vendor advisory for mitigations.
References
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