CVE-2025-51846

HIGH 7.5

CryptPad unbounded WebSocket frame flood

CVSS Score

7.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-770
Vendor	cryptpad
Product	cryptpad
Published	Apr 30, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

CryptPad / CryptPad

2025.3.1 < 2026.2.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c06ad8a0c5dab795f85f9730ec2693320c62e cve.org: https://www.cve.org/CVERecord?id=CVE-2025-51846 raw.githubusercontent.com: https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-119-01.json github.com: https://github.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory/blob/main/README.md

Credits

John Perifanis, Unisystems