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
Published: 2026-08-21
Score: 7.5 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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References
History

Fri, 21 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 21 Aug 2026 13:45:00 +0000

Type Values Removed Values Added
First Time appeared Spring
Spring spring Ai
Vendors & Products Spring
Spring spring Ai

Fri, 21 Aug 2026 12:15:00 +0000

Type Values Removed Values Added
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
Title Unbounded persistent session allocation via repeated initialize requests
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Subscriptions

Spring Spring Ai
cve-icon MITRE

Status: PUBLISHED

Assigner: vmware

Published:

Updated: 2026-08-21T14:28:41.415Z

Reserved: 2026-07-04T18:13:26.297Z

Link: CVE-2026-59279

cve-icon Vulnrichment

Updated: 2026-08-21T14:28:38.140Z

cve-icon NVD

Status : Received

Published: 2026-08-21T12:16:30.013

Modified: 2026-08-21T15:16:42.257

Link: CVE-2026-59279

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-21T13:30:04Z

Weaknesses