Vulnerabilities CVE-2026-59279

CVE-2026-59279

High

Open

TLP:CLEAR

Unbounded persistent session allocation via repeated initialize requests

NVD CVE.org

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Description

The MCP Streamable HTTP server transport (WebFlux and WebMvc variants) does not place any limit on the number of sessions it retains, and by default does not require clients to be authenticated. As a result, a remote attacker can cause the server to accumulate an unbounded number of sessions over time, gradually exhausting available memory and ultimately causing a Denial of Service that affects all legitimate clients. Affected versions: Spring AI: 2.0.0

Details

CVSS Score: 7.5
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Aug 21, 2026
Last Modified: Aug 21, 2026

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