Is CVE-2026-66733 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-66733?

CVE-2026-66733 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-66733

Description

Sonic 3 A.I.R. before commit 2492d18 contains an unbounded memory allocation vulnerability in ReceivedPacketCache::enqueuePacket() that allows unauthenticated remote attackers to crash the server process by sending a crafted UDP packet with mUniquePacketID set to the maximum uint32 value. The mUniquePacketID field is read directly from the UDP wire-format packet header without bounds checking, causing the server to allocate one CacheItem per missing packet ID gap, exhausting available host memory and propagating an uncaught std::bad_alloc exception to std::terminate().