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CVE-2026-47427 is a denial-of-service vulnerability in GitHub MCP Server affecting versions prior to 1.1.0. The flaw is caused by a nil pointer dereference in the CompletionsHandler function in pkg/github/server.go, where params.Ref is accessed without first verifying that it is non-nil. A crafted JSON-RPC completion/complete request with a missing or empty ref value can trigger a Go runtime panic. Because the panic occurs before authentication or token validation, the vulnerable code path is reachable by unauthenticated clients that can send JSON-RPC messages to the server.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
3 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.