Secuno
ENNL
Book demo

CVE-2026-47427

GitHub Mcp Server NULL pointer dereference

7.5 HIGHPublic exploitEPSS 0.77%
  1. Published28 Jul 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

GitHub Mcp Server< 1.1.0

Remediation

Fixed in
GitHub Mcp Server≥ 1.1.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-861368.1
A missing authorization vulnerability in the wgagent management daemon's session…
CVE-2026-920519.1
Spoofing issue due to invalid pointer in the Graphics component. This vulnerability was…
CVE-2026-552099.8
resdata is software for reading and writing result files from the Eclipse reservoir…
CVE-2026-779018.8
Null pointer dereference in Microsoft Office Word allows an unauthorized attacker to…
CVE-2026-242638.2
NVIDIA DGX Spark contains a vulnerability in the system firmware, where a privileged…
CVE-2026-207278.6
Null pointer dereference for some Intel(R) PROSet/Wireless WiFi Software for Windows…

Frequently asked

Is CVE-2026-47427 being actively exploited?

CVE-2026-47427 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.77%.

How severe is CVE-2026-47427?

CVE-2026-47427 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.77% probability of exploitation.

Which products are affected by CVE-2026-47427?

Affected products include GitHub Mcp Server.

How do I fix CVE-2026-47427?

Upgrade affected software to a fixed version, for example GitHub Mcp Server 1.1.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-47427 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.