Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck

CVE-2026-85436MOOS essential-moos through 10.0.1 pMOOSBridge Heap Corruption via Negative UDP Length

High 7.5

In plain English

A high-severity security flaw in essential-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 2.1% (higher than 82% of all known vulnerabilities).

Severity (CVSS 3.1)7.5High

Exploit odds (30 days)2.1%top 18.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

MOOS essential-moos through 10.0.1 contains a buffer overflow vulnerability in CMOOSUDPLink::ReadPktFromArray() that allows remote attackers to corrupt heap memory by sending UDP datagrams with negative declared lengths. Attackers can send crafted UDP packets to the configured UDPListen port to trigger an oversized memcpy operation that writes past the destination buffer, causing heap corruption and denial of service.

Affected products (as reported)

Vendor	Product	Versions
themoos	essential-moos	0 – through 10.0.1

Weakness: CWE-191 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Pull Request #21 issue-tracking, patch
Proposed fix commit (pull request not merged) patch
https://github.com/themoos/essential-moos product
MOOSUDPLink.cpp (verified sink) technical-description
VulnCheck Advisory: MOOS essential-moos through 10.0.1 pMOOSBridge Heap Corruption via Negative UDP Length third-party-advisory