CVE-2026-61387Network attack vector

Monitored-item creation denial via leaked quota

Published Aug 4, 2026 · Updated Aug 4, 2026

Resource exhaustion in Eclipse Milo 1.0.0 through 1.1.4 allows remote attackers to block monitored-item creation via OPC UA requests. SubscriptionManager increments the server-global monitored-item count before item construction but does not restore it when nested ExtensionObject decoding raises StackOverflowError. Anonymous network access is sufficient; repeated crafted CreateMonitoredItems event filters consume the finite quota until restart, while existing items and other server functions remain available.

CVSS severity6.9
Medium
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Eclipse Milo 1.0.0 through 1.1.4 allows remote attackers to block monitored-item creation via OPC UA requests. SubscriptionManager increments the server-global monitored-item count before item construction but does not restore it when nested ExtensionObject decoding raises StackOverflowError. Anonymous network access is sufficient; repeated crafted CreateMonitoredItems event filters consume the finite quota until restart, while existing items and other server functions remain available.

The record

CVE
CVE-2026-61387
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
The Eclipse Foundation
Product
Eclipse Milo
Classifications
CWE-400, CWE-772, CWE-460, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 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=1.0.0 <1.1.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Eclipse Foundation · Eclipse Miloversion=1.0.0 <1.1.5

Published CVSS scores

6.9Eclipse FoundationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
CWE-772Missing Release of Resource after Effective Lifetime
CWE-460Improper Cleanup on Thrown Exception
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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