CVE-2026-85442 MOOS core-moos through 10.4.0 MOOSDB Denial of Service via Unbounded Packet Allocation

High 8.7 Published 3 Sep 2026 Updated 4 Sep 2026

Unauthenticated attackers can cause denial of service in MOOSDB by sending crafted 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-2026-85442?

CVE-2026-85442 is a high-severity denial of service vulnerability in themoos core-moos, published on 3 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

MOOS core-moos through 10.4.0 fails to validate packet length declarations in CMOOSCommPkt::OnBytesWritten(), allowing unauthenticated attackers to trigger unbounded buffer allocation by sending crafted wire packets. Attackers can send packets with large declared lengths to exhaust server memory and cause denial of service before client authentication completes.

Weakness: CWE-789

Which versions are affected by CVE-2026-85442?

It affects 1 product.

Products include Themoos Core-Moos.

How do I fix CVE-2026-85442?

No fix has been published for CVE-2026-85442 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-2026-85442 being exploited?

There is no known exploitation of CVE-2026-85442 in the wild and no public exploit code.

Sources

Also known as GHSA-7vgj-fwc9-r6gh.