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Wednesday, 28 October 2026
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Incident database

GitHub MCP Server nil pointer dereference denial of service

GitHub MCP Server prior to version 1.1.0 is vulnerable to a denial of service attack due to improper nil checking in the CompletionsHandler function. An unauthenticated client can crash the server by sending a completion request with a missing or empty ref field.

Disclosed 28 July 2026 · Record updated 1 October 2026

Impact

Denial of service affecting the GitHub MCP Server before version 1.1.0

Our coverage

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Sources

  1. nvd.nist.govhttps://nvd.nist.gov/vuln/detail/CVE-2026-47427