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 any size limit, despite the existence of a maxMessageSize configuration parameter. 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 is used to build Model Context Protocol servers. In versions prior to 0.2.22, the readRequestBody() function in the HTTP transport layer concatenates incoming request body chunks into a string without enforcing the configured maximum message size. This lack of resource allocation limits enables a remote unauthenticated attacker to trigger memory exhaustion by sending a large POST request to the /mcp endpoint, resulting in a denial of service condition. The vulnerability is tracked as CWE-770 (Allocation of Resources Without Limits or Throttling) and 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
This vulnerability is fixed in mcp-framework version 0.2.22. Users should upgrade to version 0.2.22 or later to remediate this issue. Patch status is not explicitly confirmed in a vendor advisory, but the fix is stated in the description. Until upgraded, servers remain vulnerable to denial of service via large POST requests. No additional mitigations are specified.
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 any size limit, despite the existence of a maxMessageSize configuration parameter. 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.
CVSS v4.0
Score 8.7high
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The mcp-framework is used to build Model Context Protocol servers. In versions prior to 0.2.22, the readRequestBody() function in the HTTP transport layer concatenates incoming request body chunks into a string without enforcing the configured maximum message size. This lack of resource allocation limits enables a remote unauthenticated attacker to trigger memory exhaustion by sending a large POST request to the /mcp endpoint, resulting in a denial of service condition. The vulnerability is tracked as CWE-770 (Allocation of Resources Without Limits or Throttling) and 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
This vulnerability is fixed in mcp-framework version 0.2.22. Users should upgrade to version 0.2.22 or later to remediate this issue. Patch status is not explicitly confirmed in a vendor advisory, but the fix is stated in the description. Until upgraded, servers remain vulnerable to denial of service via large POST requests. No additional mitigations are specified.
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: 4/24/2026, 4:15:08 PM
Last updated: 5/31/2026, 9:31:34 PM
Views: 112
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.