CVE-2025-51846

CryptPad unbounded WebSocket frame flood

HIGH
7.5
CVSS Score
Published: April 30, 2026 at 04:35 PM UTC
Updated: October 14, 2026 at 01:10 PM UTC
2 products affected across 2 vendorsCryptpadCryptPad

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Severity
HIGH7.5
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

2025.3.1 ≤ v < 2026.2.2
2025.3.1 ≤ v < 2026.2.22025.3.1
Vendor states this is fixed in 2026.2.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHcisa-cg
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusANALYZED
CWE
CWE-770

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