Denial of Service Vulnerability in CryptPad by CryptPad Team
CVE-2025-51846

8.7HIGH

Key Information:

Vendor

Cryptpad

Status
Cryptpad
Vendor
CVE Published:
30 April 2026

What is CVE-2025-51846?

CryptPad version 2025.3.1 is vulnerable to an unbounded WebSocket frame flood, which allows a remote, unauthenticated attacker to overwhelm the service. This type of attack can significantly degrade performance or even deny service to all users of the CryptPad instance. The issue has been addressed in version 2026.2.2, where mitigations have been implemented to prevent such abuse.

Affected Version(s)

CryptPad 2025.3.1

CryptPad 2025.3.1 < 2026.2.2

CryptPad 2026.2.2

References

https://github.com/cryptpad/cryptpad/pull/2239/changes/1e...
https://www.cve.org/CVERecord?id=CVE-2025-51846
https://raw.githubusercontent.com/cisagov/CSAF/develop/cs...

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

John Perifanis, Unisystems
.