CVE-2026-12067: fallo en Gen Digital Avast Antivirus, Avast One, Avast…
AvastSvc denial of service via unhandled JsonCpp exceptions in native message handlers
Publicada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
0Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Track
Missing exception handlers in AvastSvc native message dispatcher (ashServ.dll) on Windows allow a local, unprivileged attacker to crash the service by sending specially crafted JSON messages.
The vulnerability spans multiple handler pathways in the RPC-based native message protocol:
* Log_NmSvc.message handler: converts JSON fields to strings without type validation and without exception boundaries.
* OpenInSz_NmSvc handler: converts URL and origin fields to strings without type checking, exposing an exception.
* OpenInSz_NmSvc.profile handler: converts the profile field to an integer without validation.
In all three cases, the exceptions are not caught by action-specific handlers and propagate up the dispatcher. The common root cause is the absence of try-catch blocks around JSON type conversions in the native message processing chain.
Productos afectados
Gen Digital · Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business SecurityGen Digital · AVG Antivirus Free, AVG Internet Security, AVG UltimateGen Digital · Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 AdvancedCVEs relacionadas — Gen Digital Avast Antivirus, Avast One, Avast…
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-82964HIGHAvast sandbox privilege escalation via unpreserved DACLs on virtualized files in aswSnx.sysEPSS 0.2%CVE-2026-80301—Avast sandbox escape via unpreserved COM pathway through Task SchedulerEPSS —CVE-2026-80302—Avast sandbox escape via arbitrary file write in virtualized environmentEPSS —CVE-2026-80303—Avast WFP stream parser integer underflow causes system crashEPSS —