CVE-2026-85443 MOOS core-moos through 10.4.0 MOOSDB Accept Loop Denial of Service

High 8.7 Published 3 Sep 2026 Updated 14 Sep 2026

An attacker can cause a denial of service in MOOSDB by opening a TCP connection and sending no data, blocking the accept thread.

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-2026-85443?

CVE-2026-85443 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 contains a denial of service vulnerability in MOOSCommServer::ListenLoop() where the accept thread performs a blocking receive without timeout during the wire-protocol handshake. An attacker can open a TCP connection to the MOOSDB port and send no data, causing the accept thread to block indefinitely while holding the socket-list lock, preventing all subsequent client connections.

Weakness: CWE-400

Which versions are affected by CVE-2026-85443?

It affects 1 product.

Products include Themoos Core-Moos.

How do I fix CVE-2026-85443?

No fix has been published for CVE-2026-85443 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-2026-85443 being exploited?

There is no known exploitation of CVE-2026-85443 in the wild and no public exploit code.

Sources

Also known as GHSA-qqc5-c4q6-4q3x.