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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.006 (45.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 45th percentile — 45.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000
Affected products
- Cryptpad — versions 2025.3.1, 2026.2.2
- Xwiki Cryptpad
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 9119a7d8-5eab-497f-8521-727c672e3725 (Patch)
- 9119a7d8-5eab-497f-8521-727c672e3725 (Third Party Advisory)
- 9119a7d8-5eab-497f-8521-727c672e3725 (Third Party Advisory)
- 9119a7d8-5eab-497f-8521-727c672e3725 (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.