CVE-2026-85441 MOOS core-moos through 10.4.0 MOOSDB Denial of Service via Negative Serialized String Length

High 8.7 Published 3 Sep 2026 Updated 4 Sep 2026

Unauthenticated attackers can crash the MOOSDB process by sending crafted messages with negative string lengths, causing a denial of service.

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-2026-85441?

CVE-2026-85441 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 that serialized string lengths are non-negative in CMOOSMsg::operator>>. Unauthenticated attackers can send a crafted message with a negative length value to the MOOSDB port, causing an unhandled exception that terminates the database process.

Weakness: CWE-195

Which versions are affected by CVE-2026-85441?

It affects 1 product.

Products include Themoos Core-Moos.

How do I fix CVE-2026-85441?

No fix has been published for CVE-2026-85441 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-2026-85441 being exploited?

There is no known exploitation of CVE-2026-85441 in the wild and no public exploit code.

Sources

Also known as GHSA-wfgh-7j4x-4xjq.