CVE-2026-39313: CWE-770: Allocation of Resources Without Limits or Throttling in QuantGeekDev mcp-framework
CVE-2026-39313 is a high-severity vulnerability in the QuantGeekDev mcp-framework versions 0. 2. 21 and below. The vulnerability arises because the readRequestBody() function concatenates HTTP request body chunks without enforcing the configured maximum message size. This allows a remote unauthenticated attacker to send a single large POST request to the /mcp endpoint, causing memory exhaustion and denial of service. The issue has been fixed in version 0. 2. 22.
AI Analysis
Technical Summary
The mcp-framework, used for building Model Context Protocol servers, contains a resource allocation vulnerability (CWE-770) in versions prior to 0.2.22. Specifically, the readRequestBody() function in the HTTP transport concatenates incoming request body chunks into a string without enforcing the maxMessageSize limit. This flaw enables remote unauthenticated attackers to cause memory exhaustion by sending a large POST request to the /mcp endpoint, resulting in a denial of service condition. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity. The issue is resolved in version 0.2.22.
Potential Impact
A remote unauthenticated attacker can cause a denial of service by exhausting server memory through a single large POST request to the /mcp endpoint. This disrupts availability of the affected mcp-framework HTTP server. There is no indication of data confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade affected mcp-framework instances to version 0.2.22 or later, where the vulnerability is fixed by enforcing the maxMessageSize limit in readRequestBody(). Since this is an open-source framework and not a cloud service, patching the software is required to remediate the issue. Patch status is confirmed by the vendor's versioning information.
CVE-2026-39313: CWE-770: Allocation of Resources Without Limits or Throttling in QuantGeekDev mcp-framework
Description
CVE-2026-39313 is a high-severity vulnerability in the QuantGeekDev mcp-framework versions 0. 2. 21 and below. The vulnerability arises because the readRequestBody() function concatenates HTTP request body chunks without enforcing the configured maximum message size. This allows a remote unauthenticated attacker to send a single large POST request to the /mcp endpoint, causing memory exhaustion and denial of service. The issue has been fixed in version 0. 2. 22.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The mcp-framework, used for building Model Context Protocol servers, contains a resource allocation vulnerability (CWE-770) in versions prior to 0.2.22. Specifically, the readRequestBody() function in the HTTP transport concatenates incoming request body chunks into a string without enforcing the maxMessageSize limit. This flaw enables remote unauthenticated attackers to cause memory exhaustion by sending a large POST request to the /mcp endpoint, resulting in a denial of service condition. The vulnerability has a CVSS 4.0 base score of 8.7, indicating high severity. The issue is resolved in version 0.2.22.
Potential Impact
A remote unauthenticated attacker can cause a denial of service by exhausting server memory through a single large POST request to the /mcp endpoint. This disrupts availability of the affected mcp-framework HTTP server. There is no indication of data confidentiality or integrity impact. No known exploits in the wild have been reported.
Mitigation Recommendations
Upgrade affected mcp-framework instances to version 0.2.22 or later, where the vulnerability is fixed by enforcing the maxMessageSize limit in readRequestBody(). Since this is an open-source framework and not a cloud service, patching the software is required to remediate the issue. Patch status is confirmed by the vendor's versioning information.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-06T19:31:07.265Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e1554682d89c981fce0d83
Added to database: 4/16/2026, 9:31:50 PM
Last enriched: 4/16/2026, 9:46:50 PM
Last updated: 4/16/2026, 10:37:50 PM
Views: 4
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