CVE-2026-27896
MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity in github.com/modelcontextprotocol/go-sdk
EPSS 0.04%
Description
MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity in github.com/modelcontextprotocol/go-sdk
How to fix CVE-2026-27896
To remediate CVE-2026-27896, upgrade the affected package to a fixed version below.
- Go/github.com/modelcontextprotocol/go-sdk—upgrade to 1.3.1 or later
- Go/github.com/modelcontextprotocol/go-sdk—upgrade to 1.3.1 or later
Is CVE-2026-27896 being exploited?
Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.
Affected packages (2)
- from 0, < 1.3.1
- from 0, < 1.3.1
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N |