What is CVE-2026-63252?

CVE-2026-63252 is a high-severity vulnerability in Eclipse Milo, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2026-08-04.

How severe is CVE-2026-63252?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Eclipse Milo

CVE-2026-63252

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.

Published 2026-08-04 · last modified 2026-10-23.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (47.9th percentile), scored 2026-11-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 48th percentile — 47.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

Eclipse Milo
Eclipse Foundation Milo — versions 0.6.0

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

github.com/eclipse-milo/milo/commit/459715793ec54b0f33367a14f94264500a0d872b (Patch)
gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598 (Issue Tracking, Vendor Advisory)
gitlab.eclipse.org/security/cve-assignment/-/work_items/179 (Patch, Issue Tracking, Vendor Advisory)

Frequently asked questions

What is CVE-2026-63252?: CVE-2026-63252 is a high-severity vulnerability in Eclipse Milo, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 7.5/10. Published 2026-08-04.
How severe is CVE-2026-63252?: High severity. CVSS v3 base score is 7.5 out of 10.