CVE-2026-63252

HIGH 8.7 ALL-YEARS

Published 2026-08-04 · Last modified 2026-08-04 · eclipse · NVD: Analyzed

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.

ELEVATED IMPACT

Severe if exploited (CVSS 8.7), but no confirmed exploitation. Patch on a normal cadence.

Exploitation likelihood

0.6%chance of exploitation in 30 days · 48th percentile

○ In CISA KEV○ Catalogued PoC◆ SSVC: exploitation none, automatable yes

Impact if exploited

8.7CVSS 4.0 · HIGH · CNA

ConfidentialityNone
IntegrityNone
AvailabilityHigh

What an attacker needs

✓Access: Reachable over the network — no local access needed
✓Privileges: No account or privileges required
✓User interaction: No user interaction needed
✓Complexity: No special conditions — reliably repeatable
✓Requirements: No special attack requirements

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked weekly for the full archive, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Affected

Vendors Eclipse Foundation Eclipse

Products Eclipse Milo Milo

Weakness (CWE)

CWE-401: Memory leak

CVSS vector

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

References and research data (JSON)

Known Affected Software Configurations

Vendor	Product	Version range
Eclipse	Milo	≥ 0.6.0 and < 1.1.5

All CVSS metrics

HIGH 8.7 v4.0 · CNA Primary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
HIGH 8.7 v4.0 · NVD Secondary
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
HIGH 7.5 v3.1 · NVD Primary
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Patches & mitigations

https://github.com/eclipse-milo/milo/commit/459715793ec54b0f33367a14f94264500a0d872b PatchCVE record · eclipse · Updated 2026-08-04T12:03:18.647Z
NVD · CVE-2026-63252 · Updated 2026-10-23T23:10:00.157
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/179 Issue TrackingPatchVendor AdvisoryCVE record · eclipse · Updated 2026-08-04T12:03:18.647Z
NVD · CVE-2026-63252 · Updated 2026-10-23T23:10:00.157

Advisories

https://gitlab.eclipse.org/security/vulnerability-reports/-/work_items/598 Issue TrackingVendor AdvisoryCVE record · eclipse · Updated 2026-08-04T12:03:18.647Z
NVD · CVE-2026-63252 · Updated 2026-10-23T23:10:00.157
https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-52662 ADVISORYEUVD · EUVD-2026-52662

Sources: NVD · CVE.org · All sources and attribution · EPSS