MCP Kotlin SDK through 0.15.0 Memory Exhaustion via Application.mcpWebSocket
MCP Kotlin SDK through 0.15.0 contains an uncontrolled memory allocation vulnerability that allows remote clients to exhaust server memory because Application.mcpWebSocket installs Ktor WebSockets without a maxFrameSize limit. Attackers can send small frame headers declaring payloads near 2 GiB over one or a few connections, forcing huge heap allocations and causing denial of service.
CVE-2026-108714
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-108714
kotlin-sdk
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/modelcontextprotocol/kotlin-sdk",
"vendor": "modelcontextprotocol",
"product": "kotlin-sdk",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "semver",
"lessThanOrEqual": "0.15.0"
}
],
"packageURL": "pkg:maven/io.modelcontextprotocol/kotlin-sdk-server",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-108714
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #21839 · Revision 1
- Added to Heist Feed
- Publisher date