What’s Vulnerable › Vulnerabilities

CVE-2025-51846: CryptPad unbounded WebSocket frame flood

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-04-30 · updated 2026-10-14
• Weakness: CWE-770

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 products

• cryptpad: from 2025.3.1 before 2026.2.2 — fixed in 2026.2.2

How to fix

Upgrade to a fixed version: cryptpad 2026.2.2. Check the vendor advisory for mitigations.

References

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

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