Vulnerability-Lookup

CVE-2025-51846 (GCVE-0-2025-51846)

Vulnerability from cvelistv5 – Published: 2026-04-30 16:35 – Updated: 2026-04-30 17:15

Title

CryptPad unbounded WebSocket frame flood

Summary

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.

Severity ?

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

8.7 (High)


                        
                          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

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

cisa-cg

References

URL

Tags

	https://github.com/cryptpad/cryptpad/pull/2239/ch…
	https://www.cve.org/CVERecord?id=CVE-2025-51846
	https://raw.githubusercontent.com/cisagov/CSAF/de…
	https://github.com/JohnPerifanis/cryptpad-cve-202…

Impacted products

	Vendor	Product	Version
	CryptPad	CryptPad	Affected: 2025.3.1 , < 2026.2.2 (custom) Unaffected: 2026.2.2

Date Public ?

2026-03-25 00:00

Credits

John Perifanis, Unisystems

Show details on NVD website

JSON

To clipboard

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VA-26-119-01

Vulnerability from csaf_cisa - Published: 2026-04-29 00:00 - Updated: 2026-04-29 00:00

Summary

CryptPad unbounded WebSocket frame flood

Notes

Legal Notice: All information products included in [https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white](https://github.com/cisagov/CSAF/tree/develop/csaf_files/IT/white) are provided \"as is\" for informational purposes only. The Department of Homeland Security (DHS) does not provide any warranties of any kind regarding any information contained within. DHS does not endorse any commercial product or service, referenced in this product or otherwise. Further dissemination of this product is governed by the Traffic Light Protocol (TLP) marking in the header. For more information about TLP, see [https://us-cert.cisa.gov/tlp/](https://us-cert.cisa.gov/tlp/).

Countries and Areas Deployed: Worldwide

Critical Infrastructure Sectors: Information Technology

Risk Evaluation: 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.

Recommended Practices: Upgrade to 2026.2.2.

Company Headquarters Location: United States

CVE-2025-51846

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-770 - Allocation of Resources Without Limits or Throttling

Vendor Fix Fixed in 2026.2.2. https://github.com/cryptpad/cryptpad/pull/2239/ch…

References

URL

Category

	https://raw.githubusercontent.com/cisagov/CSAF/de…	self
	https://github.com/cryptpad/cryptpad/pull/2239/ch…	external
	https://www.cve.org/CVERecord?id=CVE-2025-51846	external
	https://raw.githubusercontent.com/cisagov/CSAF/de…	external
	https://github.com/JohnPerifanis/cryptpad-cve-202…	external

Acknowledgments

Unisystems John Perifanis

JSON

To clipboard

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    "distribution": {
      "tlp": {
        "label": "WHITE"
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    "lang": "en-US",
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          ]
        }
      ],
      "title": "CryptPad unbounded WebSocket frame flood"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2025-51846 (GCVE-0-2025-51846)

VA-26-119-01

Tags

Sightings

Nomenclature