CVE-2026-12067
AvastSvc denial of service via unhandled JsonCpp exceptions in native message handlers
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.
| CWE | CWE-248 CWE-391 |
| Vendor | gen digital |
| Product | avast antivirus, avast one, avast premium security, avast ultimate, avast business security |
| Published | Nov 6, 2026 |
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