Nixpkgs security tracker
Untriaged
Permalink
CVE-2026-47427
7.5 HIGH
- CVSS version (CVSS): 3.1
- Attack Vector (AV): Network (N)
- Attack Complexity (AC): Low (L)
- Privileges Required (PR): None (N)
- User Interaction (UI): None (N)
- Scope (S): Unchanged (U)
- Confidentiality (C): None (N)
- Integrity (I): None (N)
- Availability (A): High (H)
- Modified Attack Vector (MAV): Network (N)
- Modified Attack Complexity (MAC): Low (L)
- Modified Privileges Required (MPR): None (N)
- Modified User Interaction (MUI): None (N)
- Modified Confidentiality (MC): None (N)
- Modified Scope (MS): Unchanged (U)
- Modified Integrity (MI): None (N)
- Modified Availability (MA): High (H)
Activity log
- Created suggestion
GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler
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.
References
-
https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7 exploitx_refsource_CONFIRM
-
https://github.com/github/github-mcp-server/pull/2502 x_refsource_MISC
-
https://github.com/github/github-mcp-server/releases/tag/v1.1.0 x_refsource_MISC
Affected products
github-mcp-server
- ==< 1.1.0
Matching in nixpkgs
pkgs.github-mcp-server
GitHub's official MCP Server
Package maintainers
-
@i-am-logger Ido Samuelson <ido.samuelson@gmail.com>