Windows Audio Service EUVD-2026-99766

Exploitation requires the attacker to already possess authenticated local access with at least low-level privileges on the target host (per AV:L and PR:L); it cannot be triggered remotely or by an unauthenticated user. The vulnerable component is the Windows Audio Service, which is enabled by default across supported Windows versions, so no special non-default configuration is needed once local access is obtained. Limiting factors: the local-only attack vector and the privilege prerequisite confine this to post-compromise scenarios, and the impact is confined to information disclosure (C:H, I:N, A:N) - no integrity or availability effect and no direct code execution.

This is a genuine but low-urgency issue. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N, base 5.5 MEDIUM) describes a locally-exploitable, low-complexity information disclosure requiring low-level privileges and no user interaction - the attacker must already have authenticated code execution on the host. The CISA SSVC decision framework reinforces a low priority: Exploitation 'none' (no observed or public exploitation), Automatable 'no', and Technical Impact 'partial'. No EPSS score was provided in the input and the CVE is NOT in CISA KEV, with no public POC indicated; there is no public exploit identified at time of analysis. All signals are therefore consistent and point the same direction - a legitimate memory-safety defect with limited real-world risk rather than an actively-exploited emergency. The only aggravating factor is reach, not severity: the flaw sits in a core Windows service present across essentially the entire supported Windows client and server fleet. Note the input Tag 'Buffer Overflow' is imprecise - the CWE (CWE-125) and description specify an out-of-bounds READ, not a write-based overflow, so there is no memory-corruption/code-execution primitive implied here.

An attacker who already has a low-privileged foothold on a Windows machine (e.g., via a standard user account or a compromised local process) runs a crafted request against the Windows Audio Service to trigger an out-of-bounds read, leaking adjacent process memory. The disclosed memory could contain secrets or data useful for a subsequent privilege-escalation or lateral-movement step. No public exploit identified at time of analysis, and exploitation is local only, so this is not a remote mass-exploitation risk.