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VulnerabilityPublished

CVE-2026-12067: Gen Digital Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business Security · Uncaught Exception

Affects Gen Digital Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business SecuritySource CVE Database V5

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Not known to be exploited.

Data as of 6 Nov 2026, 16:18 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Gen DigitalAvast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business SecurityAffected
  • <26.7
Fixed in–
Gen DigitalAVG Antivirus Free, AVG Internet Security, AVG UltimateAffected
  • <26.7
Fixed in–
Gen DigitalNorton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 AdvancedAffected
  • <26.7
Fixed in–

AI-suggested

Until a fix is available, limiting local access to trusted users may reduce risk.

Description

CVE-2026-12067 is a vulnerability in Gen Digital's Avast security products on Windows where missing exception handlers in the native message dispatcher (ashServ.dll) allow local attackers to crash the service by sending specially crafted JSON messages. The flaw affects multiple JSON field conversions without proper type validation or exception handling, causing uncaught exceptions that propagate and crash the service.

References

Community reviews

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