CVE-2026-85430: MOOS essential-moos through 10.0.1 contains an authentication bypass vulnerability in pShare that accepts UDP

Q: How do I fix CVE-2026-85430?

essential-moos: upgrade to newer than 10.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2026-85430 being exploited?

CVE-2026-85430 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-85430 affect?

CVE-2026-85430 affects essential-moos. Severity is critical (CVSS 9.1). 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

Q: How urgent is CVE-2026-85430?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-85430 is a critical-severity flaw (CVSS 9.1) affecting essential-moos. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-345
Published	2026-09-03
Last modified	2026-10-14

Publisher (CNA): VulnCheck · Vendor: themoos

Last updated 2026-10-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-03 23:17 UTCPublished CVE record published
2026-10-14 14:53 UTCUpdated Record last modified

themoos essential-moos UPGRADE

Affected: <= 10.0.1

Fixed in: newer than 10.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy essential-moos || rpm -q essential-moos || essential-moos --version

2. UPGRADE to newer than 10.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade essential-moos

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade essential-moos

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Exact fixes by distribution

Fedora 46 · ddnet · FIXED · 20.2-1.fc46 · FEDORA-2026-6991b4ab14 · source

sudo dnf upgrade --advisory=FEDORA-2026-6991b4ab14

Fedora ELN · libplacebo · FIXED · 7.360.1-5.eln159 · FEDORA-2026-92226f221e · source

sudo dnf upgrade --advisory=FEDORA-2026-92226f221e

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-85430?

essential-moos: upgrade to newer than 10.0.1. Exact commands for each OS are on this page.

Is CVE-2026-85430 being exploited?

CVE-2026-85430 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-85430 affect?

CVE-2026-85430 affects essential-moos. Severity is critical (CVSS 9.1). 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

How urgent is CVE-2026-85430?

Priority 56/100. Critical severity; Remotely exploitable, no login, no user action

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References

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