{"id":"CVE-2026-62963","summary":"Centrifugo: Decompression bomb DoS via permessage-deflate in unidirectional WebSocket transport","details":"Centrifugo is an open-source scalable real-time messaging server. Prior to 6.8.4, Centrifugo unidirectional WebSocket transport with uni_websocket.compression enabled enforced uni_websocket.message_size_limit against compressed wire-frame length in internal/websocket/conn.go advanceFrame, but ReadMessage used io.ReadAll after decompression without an output cap, allowing unauthenticated requests to /connection/uni_websocket to trigger large memory and CPU consumption. This issue is fixed in version 6.8.4.","aliases":["GHSA-q6mr-3g59-5m8x"],"modified":"2026-08-12T03:51:09.528452476Z","published":"2026-07-16T19:34:48.882Z","database_specific":{"cwe_ids":["CWE-409"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62963.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/centrifugal/centrifugo/releases/tag/v6.8.4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/62xxx/CVE-2026-62963.json"},{"type":"ADVISORY","url":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-q6mr-3g59-5m8x"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-62963"},{"type":"FIX","url":"https://github.com/centrifugal/centrifugo/commit/46d40e4ac3a5446c9745f8b219197166ae12a6e5"},{"type":"FIX","url":"https://github.com/centrifugal/centrifugo/pull/1162"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/centrifugal/centrifugo","events":[{"introduced":"0"},{"fixed":"46d40e4ac3a5446c9745f8b219197166ae12a6e5"},{"fixed":"9f72c667a306b450768a3dc462c9bc120f057de3"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"6.8.4"}],"source":["AFFECTED_FIELD","REFERENCES"]}}],"versions":["v6.8.3","v6.8.2","v6.8.1","v6.8.0","v6.7.2","v6.7.1","v6.7.0","v6.6.2","v6.6.1","v6.6.0","v6.5.2","v6.5.1","v6.5.0","v6.4.0","v6.3.1","v6.3.0","v6.2.5","v6.2.4","v6.2.3","v6.2.2","v6.2.1","v6.2.0","v6.1.0","v6.0.3","v6.0.2","v6.0.1","v6.0.0","v5.4.9","v5.4.8","v5.4.7","v5.4.6","v5.4.5","v5.4.4","v5.4.3","v5.4.2","v5.4.1","v5.4.0","v5.3.2","v5.3.1","v5.3.0","v5.2.2","v5.2.1","v5.2.0","v5.1.2","v5.1.1","v5.1.0","v5.0.4","v5.0.3","v5.0.2","v5.0.1","v5.0.0","v4.1.3","v4.1.2","v4.1.1","v4.1.0","v4.0.4","v4.0.3","v4.0.2","v4.0.1","v4.0.0","v3.2.3","v3.2.2","v3.2.1","v3.2.0","v3.1.1","v3.1.0","v3.0.5","v3.0.4","v3.0.3","v3.0.2","v3.0.1","v3.0.0","v2.8.6","v2.8.5","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.2","v2.7.1","v2.7.0","v2.6.2","v2.6.1","v2.5.1","v2.6.0","v2.5.0","v2.4.0","v2.3.1","v2.3.0","v2.2.7","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.0","v2.0.2","v2.0.1","v2.0.0","v1.8.0","v1.7.9","v1.7.8","v1.7.7","v1.7.6","v1.7.5","v1.7.4","v1.7.3","v1.7.2","v1.7.1","v1.7.0","v1.6.5","v1.6.4","v1.6.3","v1.6.2","v1.6.1","v1.6.0","v1.5.1","v1.5.0","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.3","v1.3.2","v1.3.1","v1.3.0","v1.2.0","v1.1.0","v1.0.0","v0.3.0","v0.2.4","v0.2.3","v0.2.2","v0.2.1","v0.2.0","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-62963.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"}]}