CVE-2026-63252
Received Received - Intake

UASC Server Memory Leak in Eclipse Milo

Publication date: 2026-08-04

Last updated on: 2026-08-04

Assigner: Eclipse Foundation

Description
In Eclipse Milo versions 0.6.0 through 1.1.4, UASC server transport handlers fail to release retained partial message chunks when a channel disconnects, allowing a remote unauthenticated client to exhaust pooled direct memory by repeatedly sending incomplete chunks and disconnecting, potentially terminating the server.

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Meta Information

Published
2026-08-04
Last Modified
2026-08-04
Generated
2026-08-04
AI Q&A
2026-08-04
EPSS Evaluated
N/A
NVD
CVE-2026-63252
EUVD
EUVD-2026-52662

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
eclipse milo From 0.6.0 (inc) to 1.1.4 (inc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-401 The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

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Executive Summary

This vulnerability affects Eclipse Milo versions 0.6.0 through 1.1.4. It involves UASC server transport handlers failing to release retained partial message chunks when a channel disconnects. A remote unauthenticated client can repeatedly send incomplete chunks and disconnect, causing direct memory exhaustion in pooled memory and potentially terminating the server.

Detection Guidance

Monitor for high memory usage or server crashes in Eclipse Milo versions 0.6.0 through 1.1.4. Check for repeated disconnections or incomplete message chunks in logs. Use system monitoring tools like top, htop, or jstack to observe memory consumption and potential leaks.

Impact Analysis

The vulnerability allows an attacker to exhaust system memory by sending malformed messages, which could crash the server or degrade performance. This may lead to denial of service, disrupting services relying on Eclipse Milo for OPC UA communication.

Mitigation Strategies

Upgrade Eclipse Milo to a version beyond 1.1.4 where the vulnerability is fixed. If upgrading is not immediately possible, restrict network access to the UASC server transport handlers or disable them if not required.

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