{"id":"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.","aliases":["GHSA-pj3v-9cm8-gvj8"],"modified":"2026-08-12T03:51:25.503782167Z","published":"2025-04-24T13:58:30.536Z","database_specific":{"cwe_ids":["CWE-248"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/43xxx/CVE-2025-43855.json","cna_assigner":"GitHub_M"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/trpc/trpc","events":[{"introduced":"85841a1ae4679847fd29ad5454c1a584a2e206d2"},{"fixed":"9c1c753a778ac7a2709b1e81be392231c4657319"}],"database_specific":{"source":"AFFECTED_FIELD","extracted_events":[{"introduced":"11.0.0"},{"fixed":"11.1.1"}]}}],"versions":["v11.1.0","v11.0.4","v11.0.3","v11.0.2","v11.0.1","v11.0.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-43855.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"}]}