CVE-2025-51846highCWE-770

CryptPad unbounded WebSocket frame flood

41Vexday Risk Score

No sign of exploitation. It has a public proof of concept.

ssvc Attendcvss 8.7epss 0.6%

from disclosure to weapon0 days

Published on NVDApr 30

1st PoCApr 22

exploitation probability

0.6%top 56% of all CVEs

observed exploitation

nono source reports it

1 public exploit(s)

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.

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

Affected products

CryptPad · CryptPad

public PoCs found — 1

githubgithub.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory★ 0

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c06ad8a0c5dab795f85f9730ec2693320c62e https://github.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory/blob/main/README.md 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