Allocation of Resources Without Limits or Throttling Affecting mcp/sdk package, versions >=0.5.0, <0.7.1
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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- published28 Sept 2026
- disclosed19 Aug 2026
- creditUnknown
Introduced: 19 Aug 2026
CVE-2026-53965 (opens in a new tab)How to fix?
Upgrade mcp/sdk to version 0.7.1 or higher.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the processSSEStream function. An attacker can cause the client to exhaust system memory and crash by streaming data without the expected event delimiter, resulting in unbounded buffer growth.