CVE-2026-66733 Sonic 3 A.I.R. Unbounded Memory Allocation DoS via ReceivedPacketCache
Unauthenticated remote attackers can crash the Sonic 3 A.I.R. server by sending crafted UDP packets that trigger unbounded memory allocation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66733?
CVE-2026-66733 is a high-severity denial of service vulnerability in Eukaryot sonic3air, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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().
Weakness: CWE-789
Which versions are affected by CVE-2026-66733?
How do I fix CVE-2026-66733?
No fix has been published for CVE-2026-66733 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-66733 being exploited?
There is no known exploitation of CVE-2026-66733 in the wild and no public exploit code.
Sources
Also known as GHSA-947v-gcqq-82hv.