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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-12067

AvastSvc denial of service via unhandled JsonCpp exceptions in native message handlers

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Status
Published
Published
Updated
Assigning organization
GEN

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Gen Digital Avast Antivirus, Avast One, Avast Premium Security, Avast Ultimate, Avast Business Security

Default version status: affected

  • 0 to < 26.7affected

Gen Digital AVG Antivirus Free, AVG Internet Security, AVG Ultimate

Default version status: affected

  • 0 to < 26.7affected

Gen Digital Norton Antivirus Plus, Norton 360 Standard, Norton 360 Deluxe, Norton 360 Advanced

Default version status: affected

  • 0 to < 26.7affected

References