What is CVE-2025-51846?

CVE-2025-51846 is a high-severity vulnerability in Cryptpad, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-30.

How severe is CVE-2025-51846?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2025-51846 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Resource exhaustion in Cryptpad

CVE-2025-51846

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.

EPSS: 0.007 (72.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Cryptpad — versions 2025.3.1, 2026.2.2
Xwiki Cryptpad

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

Public proof-of-concept exploits

JohnPerifanis/cryptpad-cve-2025-51846-advisory

References

url (Patch)
url (Third Party Advisory)
url (Third Party Advisory)
url (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2025-51846?: CVE-2025-51846 is a high-severity vulnerability in Cryptpad, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-04-30.
How severe is CVE-2025-51846?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2025-51846 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.