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Status published
High
CVE-2025-51846
CryptPad unbounded WebSocket frame flood
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.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- John Perifanis, Unisystems
References
- https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c06ad8a0c5dab795f85f9730ec2693320c62e
- https://www.cve.org/CVERecord?id=CVE-2025-51846
- https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-119-01.json
- https://github.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory/blob/main/README.md
Affected Vendor
CryptPad
View all reports →Affected Software
CryptPad
Vulnerable Versions:
2025.3.1, 2026.2.2
Timeline
Official Publish:
April 30th, 2026
Last Modified:
April 30th, 2026
Added to House:
July 22nd, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H