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CVE-2025-51846— CryptPad unbounded WebSocket frame flood

Quick assessment

Affected
CryptPad CryptPad
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.

CryptPad是CryptPad开源的一个协作办公套件。 CryptPad 2025.3.1版本存在安全漏洞，该漏洞源于无限制的WebSocket帧洪泛，可能导致远程未认证攻击者显著降低或拒绝所有用户的服务。

CVSS 7.5 · High EPSS 0.58% · P45

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 2

VendorProduct Version RangeStatus
CryptPad CryptPad 2025.3.1< 2026.2.2 affected
2026.2.2 unaffected
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I. Basic Information for CVE-2025-51846

Vulnerability Information
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Vulnerability Title
CryptPad unbounded WebSocket frame flood
Source: CVE Program / CVE List V5
Vulnerability Description
CryptPad 2025.3.1 allows unbounded WebSocket frame flood. A remote, unauthenticated attacker can significantly degrade or deny service for all users of a CryptPad instance. Fixed in 2026.2.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5
Vulnerability Title
CryptPad 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
CryptPad是CryptPad开源的一个协作办公套件。 CryptPad 2025.3.1版本存在安全漏洞，该漏洞源于无限制的WebSocket帧洪泛，可能导致远程未认证攻击者显著降低或拒绝所有用户的服务。
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
CryptPad CryptPad 2025.3.1 ~ 2026.2.2 -

II. Public POCs for CVE-2025-51846

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III. Intelligence Information for CVE-2025-51846

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Patches & Fixes for CVE-2025-51846 (1)

Vendor Advisories for CVE-2025-51846 (1)

Other References for CVE-2025-51846 (2)

IV. Related Vulnerabilities

Same product: CryptPad
Same vendor: CryptPad
Same weakness: CWE-770

V. Comments for CVE-2025-51846

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