Reference page — cumulative record through Wednesday, August 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.
AV AC PR UI S C I A CVSS EPSS %ile KEV N L N N U N N H 7.5 .0041 34.4 —
AFFECTED Product Versions Fixed github-mcp-server < 1.1.0 – —
TIMELINE May 19 Reserved by GitHub_M Jul 28 EXPLOIT PUBLISHED — CVE-2026-47427 (github-mcp-server). Public exploit reference added. Jul 28 Published (CNA: GitHub_M)
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.
| Date | Event | Detail |
|---|---|---|
| May 19, 2026 | Reserved | Reserved by GitHub_M |
| July 28, 2026 | EXPLOIT PUBLISHED | EXPLOIT PUBLISHED — CVE-2026-47427 (github-mcp-server). Public exploit reference added. |
| July 28, 2026 | Published | Published (CNA: GitHub_M) |
| Vendor | Product / Package | Ecosystem | Version introduced | Fixed |
|---|---|---|---|---|
| github | github-mcp-server | — | < 1.1.0 | — |
Authoritative record: CVE-2026-47427 at cve.org
Vendors: github
Weaknesses: CWE-476
This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-47427 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Wednesday, August 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.