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Widespread DoS vulnerability found in Model Context Protocol SDKs

By PulseAugur Editorial · [1 sources] ·

A widespread denial-of-service vulnerability, identified as CVE-2026-39313, has been discovered across multiple Model Context Protocol (MCP) SDKs. This flaw, stemming from an unbounded HTTP request body, allows unauthenticated attackers to exhaust a server's memory with a single request, leading to a denial-of-service. The vulnerability was first reported in April 2026 in the mcp-framework and subsequently found and patched in at least nine other MCP projects, including official SDKs for Python, Java, Go, Ruby, PHP, and TypeScript, with fixes typically involving a default body-size cap of 4 MiB. AI

IMPACT This vulnerability highlights critical security flaws in how AI model context protocols handle requests, potentially impacting the stability and availability of AI services.

RANK_REASON The article details a specific vulnerability and its impact on various software development kits, which falls under the category of a software tool issue.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

Widespread DoS vulnerability found in Model Context Protocol SDKs

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24 / 100
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Tool
The article details a specific vulnerability and its impact on various software development kits, which falls under the category of a software tool issue.
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Single-source cluster
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product, other
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High
Clearly on-topic for AI-industry coverage.
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Breaking (< 6h)
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · razashariff ·

    The first of its kind: how one unbounded request body became a denial-of-service class across every major MCP SDK

    <h2> The one-line version </h2> <p>In April 2026 I reported <strong>CVE-2026-39313</strong>, a denial-of-service flaw in an MCP server framework. It was the first CVE of its kind: an unbounded HTTP request body, CWE-770, that lets a single unauthenticated request exhaust a Model …

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