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
Not known to be exploited.
Data as of 6 Nov 2026, 16:18 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 6 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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
| Product | Affected | Fixed in |
|---|---|---|
| Gen DigitalAvast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business Security | Affected
| Fixed in– |
| Gen DigitalAVG Antivirus Free, AVG Internet Security, AVG Ultimate | Affected
| Fixed in– |
| Gen DigitalNorton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced | Affected
| 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
- gendigital.com/us/en/contact-us/security-advisories/ (opens in a new tab)
- support.avast.com/en-us/article/Update-Antivirus (opens in a new tab)
- support.avg.com/SupportArticleView?l=en&urlname=Update-AVG-Antivirus (opens in a new tab)
- support.norton.com/sp/en/us/home/current/solutions/v20240108175512167 (opens in a new tab)