{"action":"Upgrade mcp-handler to 1.1.0 or later.","affected":[{"fixed":"1.1.0","introduced":"0"}],"component":"mcp-handler","cve_ids":[],"ecosystem":"npm","exploited":false,"fixed_versions":["1.1.0"],"ghsa_id":"GHSA-w2fm-25vw-vh7f","id":"tcs_01M5KGDJ9NGPTKXXECJ018X2MD","modified_at":"2026-04-02T13:35:40.553290Z","published_at":"2026-04-01T23:58:50Z","references":["https://osv.dev/vulnerability/GHSA-w2fm-25vw-vh7f","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","https://github.com/vercel/mcp-handler"],"severity":{"label":"high","score":7.1},"sources":[{"source":"osv","source_id":"GHSA-w2fm-25vw-vh7f","url":"https://osv.dev/vulnerability/GHSA-w2fm-25vw-vh7f"}],"summary":"mcp-handler has a tool response leak across concurrent client sessions ('Race Condition')"}