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

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · cisa-cg (v2.0.3)

Decision recorded 2026-04-22 15:32 UTC

CWE

CWE-770 - Allocation of Resources Without Limits or Throttling

Assigner

cisa-cg CNA under the CISA root

CNA scorecard B 76/100 over 127 records in the last 180 days details

References

4 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

1 product

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

Date Public

2026-03-25 00:00

Credits

John Perifanis, Unisystems

Show details on NVD website

JSON

To clipboard

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}

FKIE_CVE-2025-51846

Vulnerability from fkie_nvd - Published: 2026-04-30 17:16 - Updated: 2026-10-14 13:10

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

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.

References

URL	Tags
9119a7d8-5eab-497f-8521-727c672e3725	https://github.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory/blob/main/README.md	Exploit, Third Party Advisory
9119a7d8-5eab-497f-8521-727c672e3725	https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c06ad8a0c5dab795f85f9730ec2693320c62e	Patch
9119a7d8-5eab-497f-8521-727c672e3725	https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-119-01.json	Third Party Advisory
9119a7d8-5eab-497f-8521-727c672e3725	https://www.cve.org/CVERecord?id=CVE-2025-51846	Third Party Advisory

Impacted products

	Vendor	Product	Version
	xwiki	cryptpad	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "affected",
          "product": "CryptPad",
          "vendor": "CryptPad",
          "versions": [
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              "lessThan": "2026.2.2",
              "status": "affected",
              "version": "2025.3.1",
              "versionType": "custom"
            },
            {
              "status": "unaffected",
              "version": "2026.2.2"
            }
          ]
        }
      ],
      "source": "9119a7d8-5eab-497f-8521-727c672e3725"
    }
  ],
  "configurations": [
    {
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              "versionEndExcluding": "2026.2.2",
              "versionStartIncluding": "2025.3.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "CryptPad 2025.3.1 permite una inundaci\u00f3n de tramas WebSocket ilimitada. Un atacante remoto y no autenticado puede degradar significativamente o denegar el servicio para todos los usuarios de una instancia de CryptPad. Corregido en 2026.2.2."
    }
  ],
  "id": "CVE-2025-51846",
  "lastModified": "2026-10-14T13:10:00.187",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "9119a7d8-5eab-497f-8521-727c672e3725",
        "type": "Secondary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.7,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "NONE",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "9119a7d8-5eab-497f-8521-727c672e3725",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "9119a7d8-5eab-497f-8521-727c672e3725",
        "ssvcData": {
          "id": "CVE-2025-51846",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-22T15:32:32.020942Z",
          "version": "2.0.3"
        }
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-51846",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-30T17:15:22.933048Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-30T17:16:25.467",
  "references": [
    {
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "tags": [
        "Exploit",
        "Third Party Advisory"
      ],
      "url": "https://github.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory/blob/main/README.md"
    },
    {
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c06ad8a0c5dab795f85f9730ec2693320c62e"
    },
    {
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-119-01.json"
    },
    {
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "tags": [
        "Third Party Advisory"
      ],
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-51846"
    }
  ],
  "sourceIdentifier": "9119a7d8-5eab-497f-8521-727c672e3725",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-770"
        }
      ],
      "source": "9119a7d8-5eab-497f-8521-727c672e3725",
      "type": "Secondary"
    }
  ]
}

GHSA-JMRH-F3J8-Q3C4

Vulnerability from github – Published: 2026-04-30 18:30 – Updated: 2026-04-30 18:30

Details

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2025-51846"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-770"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-30T17:16:25Z",
    "severity": "HIGH"
  },
  "details": "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.",
  "id": "GHSA-jmrh-f3j8-q3c4",
  "modified": "2026-04-30T18:30:32Z",
  "published": "2026-04-30T18:30:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-51846"
    },
    {
      "type": "WEB",
      "url": "https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c06ad8a0c5dab795f85f9730ec2693320c62e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/JohnPerifanis/cryptpad-cve-2025-51846-advisory/blob/main/README.md"
    },
    {
      "type": "WEB",
      "url": "https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/IT/white/2026/va-26-119-01.json"
    },
    {
      "type": "WEB",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-51846"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

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

Scope

1 vulnerability in this advisory, including CVE-2025-51846.

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

Known affected: 1 product Fixed: 1 product

https://github.com/cryptpad/cryptpad/pull/2239/changes/1e0c…

Open the full advisory

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.

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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

FKIE_CVE-2025-51846

GHSA-JMRH-F3J8-Q3C4

VA-26-119-01

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