PT-2026-33368 · Unknown · Mcp-Framework

Published 2026-04-16 · Updated 2026-04-17 · CVE-2026-39313

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Name of the Vulnerable Software and Affected Versions mcp-framework versions prior to 0.2.22

Description The readRequestBody() function in the HTTP transport concatenates request body chunks into a string without enforcing a size limit. Although a maxMessageSize configuration value exists, it is not applied within the readRequestBody() function. A remote unauthenticated attacker can cause memory exhaustion and a denial of service, crashing the server by sending a single large POST request to the '/mcp' endpoint.

Recommendations Update to version 0.2.22.

Fix

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2026-39313

GHSA-353C-V8X9-V7C3

Affected Products

Mcp-Framework

References · 6

• https://osv.dev/vulnerability/GHSA-353c-v8x9-v7c3 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-39313 · Security Note
• https://github.com/QuantGeekDev/mcp-framework · Note
• https://github.com/QuantGeekDev/mcp-framework/commit/f97d2bb76d6359faf10cd1fc54b4911476b62524 · Note
• https://github.com/QuantGeekDev/mcp-framework/security/advisories/GHSA-353c-v8x9-v7c3 · Note
• https://twitter.com/CVEnew/status/2045102646088917147 · Twitter Post