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TI-2026-44987 Aliases CVE-2026-62963

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

Priority MEDIUM 44CWE-409Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
None · None · High
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00524 44th percentileScored 2026-11-07
Fix Fixed centrifugo (centrifugal): 6.8.4

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
centrifugalcentrifugobefore 6.8.46.8.4Patch availableCNA
  • centrifugo Vendorcentrifugal Affected before 6.8.4 Fixed in 6.8.4 Patch available CNA

Remediation

  • Fix · CNA centrifugo (centrifugal) Fixed in 6.8.4

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-62963

References

Other 4

  • TI-2026-24830 Centrifugo: SSRF via unverified JWT claims interpolated into dynamic JWKS endpoint URL CVSS 3.1CRITICAL 9.3
  • TI-2026-36829 Centrifugo: Dynamic JWKS key cache keyed only by `kid` allows cross-issuer JWT authentication bypass CVSS 3.1HIGH 8.2
  • TI-2026-50096 Centrifugo: Client-forgeable headers emulation lets any client spoof headers forwarded to proxy backends CVSS 3.1CRITICAL 9.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences