CVE-2026-61387: milo DoS — Fix

Description

In Eclipse Milo versions 1.0.0 through 1.1.4, monitored-item quota accounting is not exception-safe: if item creation fails with an unchecked error, the server-global reservation is not restored. Deeply nested PubSub ExtensionObjects in a `CreateMonitoredItems` event filter can trigger a `StackOverflowError` during decoding, allowing an unauthenticated remote client to exhaust a finite global monitored-item quota and prevent all clients from creating new monitored items until restart. Existing monitored items and other server functions remain unaffected.

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CVSS v3.1 Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS — Exploit Prediction

0.0035

Probability of exploitation

0.27%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-400 Uncontrolled Resource Consumption

CWE-460 CWE-460

CWE-772 CWE-772

Affected Products

Vendor	Product	Versions
eclipse	milo	1.0.0 — 1.1.5

References

Advisories & Patches

https://github.com/eclipse-milo/milo/commit/587e35669f519b2d7f6d850a5f86ee5a76c3a2c5 https://github.com/eclipse-milo/milo/commit/5f3f6da2a5ea80682e1da7c58f7a1870b09d2b43 https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598

Other References

https://gitlab.eclipse.org/security/cve-assignment/-/work_items/182

Frequently Asked Questions

What is CVE-2026-61387? +

In Eclipse Milo versions 1.0.0 through 1.1.4, monitored-item quota accounting is not exception-safe: if item creation fails with an unchecked error, the server-global reservation is not restored. Deeply nested PubSub ExtensionObjects in a `CreateMonitoredItems` event filter can trigger a `StackOverflowError` during decoding, allowing an unauthenticated remote client to exhaust a finite global monitored-item quota and prevent all clients from creating new monitored items until restart. Existing monitored items and other server functions remain unaffected. It has a CVSS v3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-61387? +

CVE-2026-61387 has a CVSS v3.1 score of 7.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0035, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-61387? +

CVE-2026-61387 affects products from eclipse, specifically: milo. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-61387? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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