High severity7.5NVD Advisory· Published Jul 28, 2026· Updated Aug 8, 2026
CVE-2026-47427
CVE-2026-47427
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/github/github-mcp-serverGo | < 1.1.0 | 1.1.0 |
Affected products
3cpe:2.3:a:github:mcp_server:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:github:mcp_server:*:*:*:*:*:*:*:*range: <1.1.0
- (no CPE)range: <1.1.0
- osv-coordsRange: < 0.0.20260827T195228-160000.1.1
Patches
Vulnerability mechanics
References
5- github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58nvdPatchWEB
- github.com/github/github-mcp-server/pull/2502nvdIssue TrackingPatchWEB
- github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-w4q6-qw23-4rg7ghsaADVISORY
- github.com/github/github-mcp-server/releases/tag/v1.1.0nvdRelease NotesWEB
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