CVE-2026-85436Public exploitNetwork attack vector

Bridge crash via negative UDP length

Published Sep 3, 2026 · Updated Sep 4, 2026

Buffer overflow in pMOOSBridge in themoos essential-moos 10.0.1 and earlier allows remote attackers to crash the bridge via UDP. CMOOSUDPLink::ReadPktFromArray() accepts a negative GetBytesRequired() result, passes a signed bounds check, and converts it to an oversized size_t memcpy length. An unauthenticated four-byte datagram to the configured UDPListen port is sufficient; the demonstrated consequence is heap corruption and process termination.

CVSS severity8.7
High
EPSS probability1.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in pMOOSBridge in themoos essential-moos 10.0.1 and earlier allows remote attackers to crash the bridge via UDP. CMOOSUDPLink::ReadPktFromArray() accepts a negative GetBytesRequired() result, passes a signed bounds check, and converts it to an oversized size_t memcpy length. An unauthenticated four-byte datagram to the configured UDPListen port is sufficient; the demonstrated consequence is heap corruption and process termination.

The record

CVE
CVE-2026-85436
Published
Sep 3, 2026
Updated
Sep 4, 2026
Vendor
themoos
Product
essential-moos
Classifications
CWE-191, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=10.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

themoos · essential-moosversion=0 <=10.0.1

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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