Allocation of Resources Without Limits or Throttling Affecting org.springframework.ai:mcp-spring-webflux package, versions [2.0.0,2.0.1)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published23 Aug 2026
- disclosed21 Aug 2026
- creditUnknown
Introduced: 21 Aug 2026
NewCVE-2026-59279 (opens in a new tab)How to fix?
Upgrade org.springframework.ai:mcp-spring-webflux to version 2.0.1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through unbounded session retention in the handleInitRequest path of WebFluxStreamableServerTransportProvider and WebMvcStreamableServerTransportProvider. An unauthenticated remote attacker can exhaust server memory by repeatedly sending initialize requests that create new sessions without any built-in cap or idle reclamation. Because the transport keeps each created session in memory and accepts new sessions by default, the session list grows over time until resource exhaustion prevents legitimate clients from using the MCP server.
Notes
- Additional fixes are available for earlier versions under Enterprise Support (see the Spring Security Advisory for additional details)