High 7.5Published Jul 28, 2026

CVE-2026-47427GitHub MCP Server is GitHub's official MCP Server.

Updated under an hour ago (2026-10-19 08:00 UTC)

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It affects github mcp_server. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for github mcp_server

Exploited in the last 30 days

GitHub MCP Server is GitHub's official MCP Server. Prior to 1.1.0, the CompletionsHandler function in pkg/github/server.go accesses params.Ref without first checking whether it is nil, so a completion/complete request with a missing or empty ref field triggers a nil pointer dereference and a Go runtime panic; because the crash occurs before any authentication or token validation, any unauthenticated client able to send JSON-RPC messages can crash the server, resulting in a complete denial of service. This issue is fixed in version 1.1.0.

CVSS: 7.5 HIGH (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-476
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Aug 8, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

github mcp_server github:mcp_server	before 1.1.0	NVD

References

https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58patch
https://github.com/github/github-mcp-server/pull/2502issue-tracking, patch
https://github.com/github/github-mcp-server/releases/tag/v1.1.0release-notes
https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7exploit, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.