{"id":"CVE-2025-43855","aliases":["GHSA-pj3v-9cm8-gvj8"],"url":"https://o3.security/vulnerability/CVE-2025-43855","summary":"tRPC 11 WebSocket DoS Vulnerability","details":"tRPC allows users to build & consume fully typesafe APIs without schemas or code generation. In versions starting from 11.0.0 to before 11.1.1, an unhandled error is thrown when validating invalid connectionParams which crashes a tRPC WebSocket server. This allows any unauthenticated user to crash a tRPC 11 WebSocket server. Any tRPC 11 server with WebSocket enabled with a createContext method set is vulnerable. This issue has been patched in version 11.1.1.","published":"2025-04-24T13:58:30.536Z","modified":"2026-07-15T01:49:08.001633541Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@trpc/server","fixedVersion":"11.1.1"}],"fix":{"url":"https://github.com/trpc/trpc/commit/9beb26c636d44852e0f407f3d7a82ad54df65b4d","label":"trpc/trpc@9beb26c"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/43xxx/CVE-2025-43855.json"},{"type":"ADVISORY","url":"https://github.com/trpc/trpc/security/advisories/GHSA-pj3v-9cm8-gvj8"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-43855"},{"type":"FIX","url":"https://github.com/trpc/trpc/commit/9beb26c636d44852e0f407f3d7a82ad54df65b4d"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:08.001633541Z"}}