Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck

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

High 7.5

In plain English

A high-severity security flaw in core-moos from themoos. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)0.7%top 48.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
themoos	core-moos	0 – through 10.4.0

Weakness: CWE-195 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Pull Request #74 issue-tracking, patch
Proposed fix commit (pull request not merged) patch
https://github.com/themoos/core-moos product
MOOSMsg.cpp (verified sink) technical-description
VulnCheck Advisory: MOOS core-moos through 10.4.0 MOOSDB Denial of Service via Negative Serialized String Length third-party-advisory