{"id":"CVE-2026-62963","state":"PUBLISHED","title":"Centrifugo: Decompression bomb DoS via permessage-deflate in unidirectional WebSocket transport","description":"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.","publishedAt":"2026-07-16T19:34:48.882Z","updatedAt":"2026-07-17T13:46:40.652Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"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","source":"GitHub_M"},"assigner":"GitHub_M","products":["centrifugal centrifugo"],"affected":[{"vendor":"centrifugal","product":"centrifugo","versions":[{"version":"< 6.8.4","status":"affected"}]}],"references":["https://github.com/centrifugal/centrifugo/security/advisories/GHSA-q6mr-3g59-5m8x","https://github.com/centrifugal/centrifugo/pull/1162","https://github.com/centrifugal/centrifugo/commit/46d40e4ac3a5446c9745f8b219197166ae12a6e5","https://github.com/centrifugal/centrifugo/releases/tag/v6.8.4"],"weaknesses":["CWE-409"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/62xxx/CVE-2026-62963.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-62963","state":"PUBLISHED","datePublished":"2026-07-16T19:34:48.882Z","dateUpdated":"2026-07-17T13:46:40.652Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-14T22:32:17.732Z"},"containers":{"cna":{"title":"Centrifugo: Decompression bomb DoS via permessage-deflate in unidirectional WebSocket transport","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"centrifugal","product":"centrifugo","versions":[{"version":"< 6.8.4","status":"affected"}]}],"references":[{"url":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-q6mr-3g59-5m8x","name":"https://github.com/centrifugal/centrifugo/security/advisories/GHSA-q6mr-3g59-5m8x","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/centrifugal/centrifugo/pull/1162","name":"https://github.com/centrifugal/centrifugo/pull/1162","tags":["x_refsource_MISC"]},{"url":"https://github.com/centrifugal/centrifugo/commit/46d40e4ac3a5446c9745f8b219197166ae12a6e5","name":"https://github.com/centrifugal/centrifugo/commit/46d40e4ac3a5446c9745f8b219197166ae12a6e5","tags":["x_refsource_MISC"]},{"url":"https://github.com/centrifugal/centrifugo/releases/tag/v6.8.4","name":"https://github.com/centrifugal/centrifugo/releases/tag/v6.8.4","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH","vectorString":"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","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-409","lang":"en","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-16T19:34:48.882Z"},"source":{"advisory":"GHSA-q6mr-3g59-5m8x","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-17T13:46:33.672302Z","id":"CVE-2026-62963","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-17T13:46:40.652Z"}}]}}}