Vulnerability · Published Sep 3, 2026 · Assigned by VulnCheck

CVE-2026-85430MOOS essential-moos through 10.0.1 pShare Unauthenticated UDP Datagram Republishing

Critical 9.1

In plain English

A critical-severity insufficient verification of data authenticity 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 1.7% (higher than 77% of all known vulnerabilities).

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)1.7%top 23.2% 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 an authentication bypass vulnerability in pShare that accepts UDP datagrams from any source and republishes them with the attacker-claimed identity intact. Attackers can send crafted UDP datagrams to pShare input routes to inject messages into the local MOOS community under spoofed identities, or send malformed datagrams to crash the pShare process.

Affected products (as reported)

Vendor	Product	Versions
themoos	essential-moos	0 – through 10.0.1

Weakness: CWE-345 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

References

Pull Request #18 issue-tracking, patch
Proposed fix commit (pull request not merged) patch
https://github.com/themoos/essential-moos product
Listener.cpp (verified sink) technical-description
VulnCheck Advisory: MOOS essential-moos through 10.0.1 pShare Unauthenticated UDP Datagram Republishing third-party-advisory