CVE-2026-62963: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in centrifugal centrifugo
Centrifugo versions prior to 6.8.4 contain a vulnerability in the unidirectional WebSocket transport when uni_websocket.compression is enabled. The server enforces a message size limit on compressed frames but fails to limit memory usage after decompression, allowing unauthenticated requests to trigger excessive memory and CPU consumption. This issue is fixed in version 6.8.4.
AI Analysis
Technical Summary
CVE-2026-62963 describes an improper handling of highly compressed data (CWE-409) in Centrifugo before version 6.8.4. The vulnerability arises because the unidirectional WebSocket transport enforces a message size limit on the compressed wire-frame length but uses io.ReadAll after decompression without limiting the output size. This allows unauthenticated attackers to send requests to /connection/uni_websocket that cause large memory and CPU consumption, potentially leading to denial of service. The issue is resolved in Centrifugo 6.8.4.
Potential Impact
An unauthenticated attacker can send specially crafted compressed WebSocket frames that bypass the message size limit after decompression, causing the server to consume excessive memory and CPU resources. This can lead to denial of service conditions affecting availability.
Mitigation Recommendations
Upgrade Centrifugo to version 6.8.4 or later, where this vulnerability is fixed. No other mitigation or temporary fix is indicated. Patch status is confirmed by the vendor advisory stating the issue is fixed in 6.8.4.
CVE-2026-62963: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in centrifugal centrifugo
Description
Centrifugo versions prior to 6.8.4 contain a vulnerability in the unidirectional WebSocket transport when uni_websocket.compression is enabled. The server enforces a message size limit on compressed frames but fails to limit memory usage after decompression, allowing unauthenticated requests to trigger excessive memory and CPU consumption. This issue is fixed in version 6.8.4.
CVSS v4.0
Score 8.7high
Affected software
pkg:golang/github.com/centrifugal/centrifugoRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-62963 describes an improper handling of highly compressed data (CWE-409) in Centrifugo before version 6.8.4. The vulnerability arises because the unidirectional WebSocket transport enforces a message size limit on the compressed wire-frame length but uses io.ReadAll after decompression without limiting the output size. This allows unauthenticated attackers to send requests to /connection/uni_websocket that cause large memory and CPU consumption, potentially leading to denial of service. The issue is resolved in Centrifugo 6.8.4.
Potential Impact
An unauthenticated attacker can send specially crafted compressed WebSocket frames that bypass the message size limit after decompression, causing the server to consume excessive memory and CPU resources. This can lead to denial of service conditions affecting availability.
Mitigation Recommendations
Upgrade Centrifugo to version 6.8.4 or later, where this vulnerability is fixed. No other mitigation or temporary fix is indicated. Patch status is confirmed by the vendor advisory stating the issue is fixed in 6.8.4.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-07-14T22:32:17.732Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a59358368715ace439a687a
Added to database: 07/16/2026, 19:48:19 UTC
Last enriched: 07/23/2026, 22:46:33 UTC
Last updated: 08/28/2026, 22:52:12 UTC
Views: 74
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