EUVD-2026-63931
GHSA-2g9x-r8w8-qjff
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Network-reachable with no authentication or complexity barrier; impact is Availability-only, as session accumulation causes DoS with no confidentiality or integrity exposure.
Primary rating from Vendor (vmware).
CVSS VectorVendor: vmware
Lifecycle Timeline
2DescriptionCVE.org
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
AnalysisAI
Unbounded session accumulation in Spring AI 2.0.0's MCP Streamable HTTP server transport enables remote unauthenticated attackers to exhaust server memory, ultimately causing a Denial of Service that disrupts all legitimate clients. Both WebFlux and WebMvc transport variants are affected because neither enforces a session cap nor mandates client authentication by default. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Spring AI application must be running version 2.0.0 with the MCP Streamable HTTP server transport enabled - either the WebFlux or WebMvc variant. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 7.5 High score is well-calibrated for this vulnerability: AV:N/AC:L/PR:N/UI:N reflects that exploitation requires nothing beyond network connectivity and the ability to issue HTTP requests. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patched version was identified in the available data at time of analysis; refer to the Spring Security advisory at https://spring.io/security/cve-2026-59279 for the latest patch availability and recommended upgrade version. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: inventory all systems running Spring AI 2.0.0, confirm whether MCP endpoints are exposed to untrusted networks, and assess business criticality of affected services. …
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External POC / Exploit Code
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