Vulnerability-Lookup

GHSA-C68Q-H477-5646

Vulnerability from github – Published: 2026-07-03 09:31 – Updated: 2026-07-03 09:31

Details

By default, curl automatically responds to WebSocket PING frames. Because curl lacks an upper bound on memory allocation for unacknowledged frames, a malicious server can exhaust all available memory by flooding curl with rapid, sequential PING messages.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-11586"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-03T07:16:23Z",
    "severity": null
  },
  "details": "By default, curl automatically responds to WebSocket PING frames. Because curl\nlacks an upper bound on memory allocation for unacknowledged frames, a\nmalicious server can exhaust all available memory by flooding curl with rapid,\nsequential PING messages.",
  "id": "GHSA-c68q-h477-5646",
  "modified": "2026-07-03T09:31:25Z",
  "published": "2026-07-03T09:31:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-11586"
    },
    {
      "type": "WEB",
      "url": "https://hackerone.com/reports/3788931"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-11586.html"
    },
    {
      "type": "WEB",
      "url": "https://curl.se/docs/CVE-2026-11586.json"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-11586 (GCVE-0-2026-11586)

Vulnerability from cvelistv5 – Published: 2026-07-03 06:13 – Updated: 2026-07-03 06:13

Title

WS Auto-PONG memory exhaustion

Summary

Severity ?

No CVSS data available.

CWE

CWE-770 Allocation of Resources Without Limits or Throttling

Assigner

curl

References

URL

Tags

	https://curl.se/docs/CVE-2026-11586.json
	https://curl.se/docs/CVE-2026-11586.html
	https://hackerone.com/reports/3788931

Impacted products

	Vendor	Product	Version
	curl	curl	Affected: 8.20.0 , ≤ 8.20.0 (semver) Affected: 8.19.0 , ≤ 8.19.0 (semver) Affected: 8.18.0 , ≤ 8.18.0 (semver) Affected: 8.17.0 , ≤ 8.17.0 (semver) Affected: 8.16.0 , ≤ 8.16.0 (semver)

Credits

evergarden1123 on hackerone (AntAISecurityLab) Stefan Eissing

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JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "curl",
          "vendor": "curl",
          "versions": [
            {
              "lessThanOrEqual": "8.20.0",
              "status": "affected",
              "version": "8.20.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.19.0",
              "status": "affected",
              "version": "8.19.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.18.0",
              "status": "affected",
              "version": "8.18.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.17.0",
              "status": "affected",
              "version": "8.17.0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "8.16.0",
              "status": "affected",
              "version": "8.16.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "evergarden1123 on hackerone (AntAISecurityLab)"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Stefan Eissing"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "By default, curl automatically responds to WebSocket PING frames. Because curl\nlacks an upper bound on memory allocation for unacknowledged frames, a\nmalicious server can exhaust all available memory by flooding curl with rapid,\nsequential PING messages."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "CWE-770 Allocation of Resources Without Limits or Throttling",
              "lang": "en"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-03T06:13:04.448Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "name": "json",
          "url": "https://curl.se/docs/CVE-2026-11586.json"
        },
        {
          "name": "www",
          "url": "https://curl.se/docs/CVE-2026-11586.html"
        },
        {
          "name": "issue",
          "url": "https://hackerone.com/reports/3788931"
        }
      ],
      "title": "WS Auto-PONG memory exhaustion"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
    "assignerShortName": "curl",
    "cveId": "CVE-2026-11586",
    "datePublished": "2026-07-03T06:13:04.448Z",
    "dateReserved": "2026-06-08T12:17:42.037Z",
    "dateUpdated": "2026-07-03T06:13:04.448Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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

GHSA-C68Q-H477-5646

CVE-2026-11586 (GCVE-0-2026-11586)

Tags

Sightings

Nomenclature