Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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

Quick assessment

Affected
centrifugal centrifugo
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

centrifugal centrifugo是centrifugal个人开发者开源的一个实时消息服务器。 Centrifugal Labs Centrifugo 6.8.4之前版本存在资源管理错误漏洞，该漏洞源于单向WebSocket传输中压缩和解压处理不当，可能导致未经身份验证的攻击者通过/connection/uni_websocket请求触发大量内存和CPU消耗。

AI Predicted 7.5 Difficulty: Easy EPSS 0.52% · P43

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
centrifugal centrifugo < 6.8.4 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-62963

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Centrifugo: Decompression bomb DoS via permessage-deflate in unidirectional WebSocket transport
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
Vulnerability Title
Centrifugal Labs Centrifugo 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
centrifugal centrifugo是centrifugal个人开发者开源的一个实时消息服务器。 Centrifugal Labs Centrifugo 6.8.4之前版本存在资源管理错误漏洞，该漏洞源于单向WebSocket传输中压缩和解压处理不当，可能导致未经身份验证的攻击者通过/connection/uni_websocket请求触发大量内存和CPU消耗。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
centrifugal centrifugo < 6.8.4 -

II. Public POCs for CVE-2026-62963

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-62963

请登录查看更多情报信息。

Patches & Fixes for CVE-2026-62963 (1)

Vendor Advisories for CVE-2026-62963 (1)

Vendor Pages for CVE-2026-62963 (1)

IV. Related Vulnerabilities

Same product: centrifugo
Same vendor: centrifugal
Same weakness: CWE-409

V. Comments for CVE-2026-62963

No comments yet

Leave a comment