Is mcp-handler affected by GHSA-w2fm-25vw-vh7f?

npm mcp-handler is affected in <1.1.0.

Is GHSA-w2fm-25vw-vh7f being exploited?

Not on the CISA KEV list. EPSS exploit probability is not available.

high

GHSA-w2fm-25vw-vh7f

Q: Is GHSA-w2fm-25vw-vh7f being exploited?

Not on the CISA KEV list. EPSS exploit probability is not available.

npm · mcp-handler

Summary

mcp-handler has a tool response leak across concurrent client sessions ('Race Condition')

Severity: high
Published: 2026-04-01

References

https://github.com/vercel/mcp-handler/security/advisories/GHSA-w2fm-25vw-vh7f
https://nvd.nist.gov/vuln/detail/CVE-2026-25536
https://github.com/advisories/GHSA-345p-7cg4-v4c7

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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.