CVE-2025-51846 PUBLISHED

CryptPad unbounded WebSocket frame flood

Assigner: cisa-cg
Reserved: 16.06.2025 Published: 30.04.2026 Updated: 30.04.2026

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.

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS Score: 7.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	None
Privileges Required	None	Integrity Impact	None
User Interaction	None	Availability Impact	High

CVSS 3.1

CVSS Vector: 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	CryptPad
Product	CryptPad
Versions	Default: affected affected from 2025.3.1 to 2026.2.2 (excl.) Version 2026.2.2 is unaffected

CVE-2025-51846 PUBLISHED

CryptPad unbounded WebSocket frame flood

Metrics

Product Status

Credits

References

Problem Types