Is github.com/modelcontextprotocol/go-sdk affected by CVE-2026-27896?

Go github.com/modelcontextprotocol/go-sdk is affected in <1.3.1.

Is CVE-2026-27896 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

medium

CVE-2026-27896

Q: Is CVE-2026-27896 being exploited?

Not on the CISA KEV list. EPSS exploit probability is 0.3%.

Go · github.com/modelcontextprotocol/go-sdk

Summary

MCP Go SDK Vulnerable to Improper Handling of Case Sensitivity in github.com/modelcontextprotocol/go-sdk

Severity: medium
EPSS: 0.3% (p18)
Also known as: GHSA-wvj2-96wp-fq3f, GO-2026-4569
Published: 2026-03-10

References

https://github.com/modelcontextprotocol/go-sdk/security/advisories/GHSA-wvj2-96wp-fq3f
https://nvd.nist.gov/vuln/detail/CVE-2026-27896
https://github.com/modelcontextprotocol/go-sdk/commit/7b8d81c264074404abdf5aa16e2cf0c2d9c64cc0

Related advisories

CVE-2026-34742 — high · Go/github.com/modelcontextprotocol/go-sdk
CVE-2026-33252 — medium · Go/github.com/modelcontextprotocol/go-sdk
GHSA-q382-vc8q-7jhj — medium · Go/github.com/modelcontextprotocol/go-sdk

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.