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CVE-2026-39313

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

HIGH
8.7
CVSS Score
Published: April 16, 2026 at 09:24 PM UTC
Updated: October 26, 2026 at 09:10 PM UTC
1 product affected across 1 vendorMcp Framework

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Severity
HIGH8.7
Exploit prediction
EPSS 0.5%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Mcp Framework· Quantgeekdev
90%
v < 0.2.22
Affected range stops below 0.2.22, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (2)

x_refsource_CONFIRM
Source: cverecord
https://github.com/QuantGeekDev/mcp-framework/security/advisories/GHSA-353c-v8x9-v7c3
x_refsource_MISC
Source: cverecord
https://github.com/QuantGeekDev/mcp-framework/commit/f97d2bb76d6359faf10cd1fc54b4911476b62524

SSVC — Action Prioritization

SSVCPoCAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.7HIGHGitHub_M
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-770

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