CVE-2026-85436: MOOS essential-moos through 10.0.1 contains a buffer overflow vulnerability in CMOOSUDPLink::ReadPktFromArray(

Q: How do I fix CVE-2026-85436?

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

Q: Is CVE-2026-85436 being exploited?

CVE-2026-85436 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-2026-85436 affect?

CVE-2026-85436 affects essential-moos. Severity is high (CVSS 7.5). 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

Q: How urgent is CVE-2026-85436?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

This month

HIGH 7.5REMOTEUPGRADE

CVE-2026-85436 is a high-severity flaw (CVSS 7.5) 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 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.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	2.1% (top 19%)
CISA exploited list	No
Weakness	CWE-191
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 23:27 UTCUpdated Record last modified

themoos essential-moos UPGRADE

Affected: < 10.0.1

Fixed in: 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 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.

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-2026-85436?

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

Is CVE-2026-85436 being exploited?

CVE-2026-85436 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-2026-85436 affect?

CVE-2026-85436 affects essential-moos. Severity is high (CVSS 7.5). 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

How urgent is CVE-2026-85436?

Priority 52/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

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References

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