CVE-2025-51846

CryptPad unbounded WebSocket frame flood

CVSS 8.7 HIGHEPSS 0.6%CWE-770

Vexday Risk Score

41Attention

SSVC decision (CISA)

Attend

PoC available → attend closely

CVSS 8.7EPSS 0.6%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

22 Apr 2026Public PoC

30 Apr 2026Published on NVD

Recommendation: Plan a near-term fix — a public PoC already exists.

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.

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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