CVE-2025-51846

CryptPad unbounded WebSocket frame flood

Published Apr 30, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Xwiki
Xwiki cryptpad
CPEs cpe:2.3:a:xwiki:cryptpad:*:*:*:*:*:*:*:*
Vendors & Products Xwiki
Xwiki cryptpad
Type Values Removed Values Added
First Time appeared Cryptpad
Cryptpad cryptpad
Vendors & Products Cryptpad
Cryptpad cryptpad
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title CryptPad unbounded WebSocket frame flood
Weaknesses CWE-770
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
cisa-cg
Published
Updated
Apr 30, 2026, 5:15 PM
Reserved
Jun 16, 2025, 3:28 AM
Status
Analyzed
Published
Apr 30, 2026, 5:16 PM
Modified
Oct 14, 2026, 1:10 PM