Vulnerability-Lookup

CVE-2026-61666 (GCVE-0-2026-61666)

Vulnerability from cvelistv5 – Published: 2026-08-17 16:16 – Updated: 2026-08-17 17:00

Title

websocket-driver: Denial of service via malformed Host header

Summary

websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.2, WebSocket::Driver.server() passes a malformed Host header to URI.parse in lib/websocket/http/request.rb without catching URI::InvalidURIError, allowing a remote client to crash a TCP-backed WebSocket server when the application does not catch the error from parse(). This issue is fixed in version 0.8.2.

Severity

8.9 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-17 17:00 UTC

CWE

CWE-248 - Uncaught Exception

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/faye/websocket-driver-ruby/sec…	x_refsource_CONFIRM
https://github.com/faye/websocket-driver-ruby/com…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
faye	websocket-driver-ruby	Affected: < 0.8.2	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-61666

Vulnerability from fkie_nvd - Published: 2026-08-17 17:16 - Updated: 2026-08-17 17:16

Severity

8.9 (High) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/faye/websocket-driver-ruby/commit/7d6fd87759a2fdc83590d3b49ffa661dc53fa128
	security-advisories@github.com	https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-2x63-gw47-w4mm

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "websocket-driver-ruby",
          "vendor": "faye",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 0.8.2"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.2, WebSocket::Driver.server() passes a malformed Host header to URI.parse in lib/websocket/http/request.rb without catching URI::InvalidURIError, allowing a remote client to crash a TCP-backed WebSocket server when the application does not catch the error from parse(). This issue is fixed in version 0.8.2."
    }
  ],
  "id": "CVE-2026-61666",
  "lastModified": "2026-08-17T17:16:39.917",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackRequirements": "PRESENT",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.9,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
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          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
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GHSA-2X63-GW47-W4MM

Vulnerability from github – Published: 2026-07-21 18:34 – Updated: 2026-07-21 18:34

Summary

websocket-driver-ruby: Denial of service via malformed Host header

Details

Impact

If this library is used to implement a WebSocket server on top of a TCP server, by using the WebSocket::Driver.server() method, then a client can cause the server to crash by sending a Host header that is not a valid host[:port] string. When this happens, a URI::InvalidURIError exception is raised which is not caught, and this can cause the server process to crash if the application does not catch the error from the parse() method itself.

Patches

The issue has been patched in version 0.8.2 by making the request parser catch URI::InvalidURIError and enter an error state if the Host header is malformed. This means the request is considered invalid and should not establish a WebSocket connection.

Workarounds

No known workarounds exist.

Acknowledgements

This issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.

Severity

8.9 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "RubyGems",
        "name": "websocket-driver"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-61666"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-248"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-21T18:34:42Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nIf this library is used to implement a WebSocket server on top of a TCP server, by using the `WebSocket::Driver.server()` method, then a client can cause the server to crash by sending a `Host` header that is not a valid `host[:port]` string. When this happens, a `URI::InvalidURIError` exception is raised which is not caught, and this can cause the server process to crash if the application does not catch the error from the `parse()` method itself.\n\n### Patches\n\nThe issue has been patched in version 0.8.2 by making the request parser catch `URI::InvalidURIError` and enter an error state if the `Host` header is malformed. This means the request is considered invalid and should not establish a WebSocket connection.\n\n### Workarounds\n\nNo known workarounds exist.\n\n### Acknowledgements\n\nThis issue was discovered and reported by Pranjali Thakur, DepthFirst Security Research Team.",
  "id": "GHSA-2x63-gw47-w4mm",
  "modified": "2026-07-21T18:34:42Z",
  "published": "2026-07-21T18:34:42Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/faye/websocket-driver-ruby/security/advisories/GHSA-2x63-gw47-w4mm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/faye/websocket-driver-ruby/commit/7d6fd87759a2fdc83590d3b49ffa661dc53fa128"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/faye/websocket-driver-ruby"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
      "type": "CVSS_V4"
    }
  ],
  "summary": "websocket-driver-ruby: Denial of service via malformed Host header"
}

ubuntu-cve-2026-61666

Vulnerability from osv_ubuntu

Published

2026-08-17 17:16

Modified

2026-08-19 11:06

Summary

Details

Severity

8.9 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-61666	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-61666	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-websocket-driver",
            "binary_version": "0.6.3-2build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "ruby-websocket-driver",
        "purl": "pkg:deb/ubuntu/ruby-websocket-driver@0.6.3-2build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
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            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.3-1",
        "0.6.3-1build1",
        "0.6.3-2",
        "0.6.3-2build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-websocket-driver",
            "binary_version": "0.6.3-2build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "ruby-websocket-driver",
        "purl": "pkg:deb/ubuntu/ruby-websocket-driver@0.6.3-2build3?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.3-2build1",
        "0.6.3-2build2",
        "0.6.3-2build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-websocket-driver",
            "binary_version": "0.6.3-2build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "ruby-websocket-driver",
        "purl": "pkg:deb/ubuntu/ruby-websocket-driver@0.6.3-2build4?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.3-2build3",
        "0.6.3-2build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-websocket-driver",
            "binary_version": "0.6.3-3build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "ruby-websocket-driver",
        "purl": "pkg:deb/ubuntu/ruby-websocket-driver@0.6.3-3build3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.3-3build1",
        "0.6.3-3build2",
        "0.6.3-3build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-websocket-driver",
            "binary_version": "0.6.3-3build7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "ruby-websocket-driver",
        "purl": "pkg:deb/ubuntu/ruby-websocket-driver@0.6.3-3build7?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.3-3build5",
        "0.6.3-3build6",
        "0.6.3-3build7"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "ruby-websocket-driver",
            "binary_version": "0.6.3-3ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "ruby-websocket-driver",
        "purl": "pkg:deb/ubuntu/ruby-websocket-driver@0.6.3-3ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.6.3-3ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "websocket-driver is a WebSocket protocol handler with pluggable I/O. Prior to 0.8.2, WebSocket::Driver.server() passes a malformed Host header to URI.parse in lib/websocket/http/request.rb without catching URI::InvalidURIError, allowing a remote client to crash a TCP-backed WebSocket server when the application does not catch the error from parse(). This issue is fixed in version 0.8.2.",
  "id": "UBUNTU-CVE-2026-61666",
  "modified": "2026-08-19T11:06:32Z",
  "published": "2026-08-17T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-61666"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-61666"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-61666"
  ]
}

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.

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.

Action not permitted

CVE-2026-61666 (GCVE-0-2026-61666)

FKIE_CVE-2026-61666

GHSA-2X63-GW47-W4MM

Impact

Patches

Workarounds

Acknowledgements

ubuntu-cve-2026-61666

Vulnerability from osv_ubuntu

Tags

Sightings

Nomenclature