High 8.7Published Jul 16, 2026

CVE-2026-62963Centrifugo: Decompression bomb DoS via permessage-deflate in unidirectional WebSocket transport

Updated under an hour ago (Oct 27, 2026, 12:30 AM ET)

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It affects centrifugal centrifugo. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for centrifugal centrifugo

Exploited in the last 30 days

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.

CVSS: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-409
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Deferred
Record last updated: Jul 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

centrifugal centrifugo centrifugal:centrifugo (from the name)	before 6.8.4	CNA record

References

References

https://github.com/centrifugal/centrifugo/security/advisories/GHSA-q6mr-3g59-5m8x	x-refsource-confirm
https://github.com/centrifugal/centrifugo/pull/1162	x-refsource-misc
https://github.com/centrifugal/centrifugo/commit/46d40e4ac3a5446c9745f8b219197166ae12a6e5	x-refsource-misc
https://github.com/centrifugal/centrifugo/releases/tag/v6.8.4	x-refsource-misc

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.