CVE-2026-108714 MCP Kotlin SDK - Denial of Service

MCP Kotlin SDK <= 0.15.0 contains a denial of service vulnerability caused by lack of maxFrameSize limit in Ktor WebSockets in Application.mcpWebSocket, letting remote clients exhaust server memory by sending large payloads, exploit requires network access.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.36% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
11 October 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to a version later than 0.15.0 or the latest available version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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