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TI-2026-28303 Aliases CVE-2026-39313GHSA-353c-v8x9-v7c3

MCP-Framework: Unbounded memory allocation in readRequestBody allows denial of service via HTTP transport

Priority HIGH 77CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

mcp-framework is a framework for building Model Context Protocol (MCP) servers. In versions 0.2.21 and below, the readRequestBody() function in the HTTP transport concatenates request body chunks into a string with no size limit. Although a maxMessageSize configuration value exists, it is never enforced in readRequestBody(). A remote unauthenticated attacker can crash any mcp-framework HTTP server by sending a single large POST request to /mcp, causing memory exhaustion and denial of service. This issue has been fixed in version 0.2.22.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00495 42nd percentileScored 2026-11-07
Fix Fixed mcp-framework (QuantGeekDev): 0.2.22mcp-framework (npm): 0.2.22

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
QuantGeekDevmcp-frameworkbefore 0.2.220.2.22Patch availableCNA
—mcp-framework (npm)before 0.2.220.2.22Patch availableGHSA-353c-v8x9-v7c3
  • mcp-framework VendorQuantGeekDev Affected before 0.2.22 Fixed in 0.2.22 Patch available CNA
  • mcp-framework (npm) Vendor— Affected before 0.2.22 Fixed in 0.2.22 Patch available GHSA-353c-v8x9-v7c3

Remediation

  • Fix · CNA mcp-framework (QuantGeekDev) Fixed in 0.2.22
  • Fix · GHSA-353c-v8x9-v7c3 mcp-framework (npm) Fixed in 0.2.22 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-39313
  2. 2026-10-03 Alias added: GHSA-353c-v8x9-v7c3

References

Advisory 1

Other 3

  • TI-2026-80235 OS command injection in QuantGeekDev docker-mcp via project_name CVSS 4.0MEDIUM 5.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences