Vulnerability-Lookup

CVE-2026-8924 (GCVE-0-2026-8924)

Vulnerability from cvelistv5 – Published: 2026-07-03 06:15 – Updated: 2026-09-15 06:03

Title

trailing dot domain super cookie

Summary

A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set "super cookies" that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

Severity

9.1 (Critical)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-06 16:56 UTC

CWE

CWE-201 - Information Exposure Through Sent Data

Assigner

curl redhat root

References

3 references

URL	Tags
https://curl.se/docs/CVE-2026-8924.json
https://curl.se/docs/CVE-2026-8924.html
https://hackerone.com/reports/3733905

Impacted products

3 products

Vendor	Product	Version	CPE status
curl	curl	Affected: 7.46.0 , < 8.14.2 (semver) Affected: 8.15.0 , < 8.16.1 (semver) Affected: 8.17.0 , < 8.20.1 (semver)	guessed
curl	curl	Affected: e77b5b7453c1e8ccd7ec0816890d98e2f392e465 , < 51beed175dbfc37da3113f6acce60c630c070ce8 (git)	guessed
curl	curl	Affected: 8.20.0 Affected: 8.19.0 Affected: 8.18.0 Affected: 8.17.0 Affected: 8.16.0 Affected: 8.15.0 Affected: 8.14.1 Affected: 8.14.0 Affected: 8.13.0 Affected: 8.12.1 Affected: 8.12.0 Affected: 8.11.1 Affected: 8.11.0 Affected: 8.10.1 Affected: 8.10.0 Affected: 8.9.1 Affected: 8.9.0 Affected: 8.8.0 Affected: 8.7.1 Affected: 8.7.0 Affected: 8.6.0 Affected: 8.5.0 Affected: 8.4.0 Affected: 8.3.0 Affected: 8.2.1 Affected: 8.2.0 Affected: 8.1.2 Affected: 8.1.1 Affected: 8.1.0 Affected: 8.0.1 Affected: 8.0.0 Affected: 7.88.1 Affected: 7.88.0 Affected: 7.87.0 Affected: 7.86.0 Affected: 7.85.0 Affected: 7.84.0 Affected: 7.83.1 Affected: 7.83.0 Affected: 7.82.0 Affected: 7.81.0 Affected: 7.80.0 Affected: 7.79.1 Affected: 7.79.0 Affected: 7.78.0 Affected: 7.77.0 Affected: 7.76.1 Affected: 7.76.0 Affected: 7.75.0 Affected: 7.74.0 Affected: 7.73.0 Affected: 7.72.0 Affected: 7.71.1 Affected: 7.71.0 Affected: 7.70.0 Affected: 7.69.1 Affected: 7.69.0 Affected: 7.68.0 Affected: 7.67.0 Affected: 7.66.0 Affected: 7.65.3 Affected: 7.65.2 Affected: 7.65.1 Affected: 7.65.0 Affected: 7.64.1 Affected: 7.64.0 Affected: 7.63.0 Affected: 7.62.0 Affected: 7.61.1 Affected: 7.61.0 Affected: 7.60.0 Affected: 7.59.0 Affected: 7.58.0 Affected: 7.57.0 Affected: 7.56.1 Affected: 7.56.0 Affected: 7.55.1 Affected: 7.55.0 Affected: 7.54.1 Affected: 7.54.0 Affected: 7.53.1 Affected: 7.53.0 Affected: 7.52.1 Affected: 7.52.0 Affected: 7.51.0 Affected: 7.50.3 Affected: 7.50.2 Affected: 7.50.1 Affected: 7.50.0 Affected: 7.49.1 Affected: 7.49.0 Affected: 7.48.0 Affected: 7.47.1 Affected: 7.47.0 Affected: 7.46.0	guessed

Credits

vegagent on hackerone Daniel Stenberg

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "NETWORK",
              "availabilityImpact": "NONE",
              "baseScore": 9.1,
              "baseSeverity": "CRITICAL",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "NONE",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2026-8924",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-07-06T16:56:31.860200Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
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        "providerMetadata": {
          "dateUpdated": "2026-07-06T16:57:16.362Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://hackerone.com/reports/3733905"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
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              "status": "affected",
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "vegagent on hackerone"
        },
        {
          "lang": "en",
          "type": "remediation developer",
          "value": "Daniel Stenberg"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A flaw in curl\u2019s cookie parsing logic allows a malicious HTTP server to set\n\"super cookies\" that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-201",
              "description": "Information Exposure Through Sent Data",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T06:03:20.848Z",
        "orgId": "2499f714-1537-4658-8207-48ae4bb9eae9",
        "shortName": "curl"
      },
      "references": [
        {
          "url": "https://curl.se/docs/CVE-2026-8924.json"
        },
        {
          "url": "https://curl.se/docs/CVE-2026-8924.html"
        },
        {
          "url": "https://hackerone.com/reports/3733905"
        }
      ],
      "title": "trailing dot domain super cookie",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      },
      "x_osv": {
        "affected": [
          {
            "ranges": [
              {
                "events": [
                  {
                    "introduced": "7.46.0"
                  },
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                ],
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              }
            ],
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            ]
          }
        ],
        "aliases": [
          "CVE-2026-8924"
        ],
        "credits": [
          {
            "name": "vegagent on hackerone",
            "type": "finder"
          },
          {
            "name": "Daniel Stenberg",
            "type": "remediation developer"
          }
        ],
        "database_specific": {
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            "desc": "Information Exposure Through Sent Data",
            "id": "CWE-201"
          },
          "URL": "https://curl.se/docs/CVE-2026-8924.json",
          "affects": "both",
          "issue": "https://hackerone.com/reports/3733905",
          "last_affected": "8.20.0",
          "package": "curl",
          "severity": "Low",
          "www": "https://curl.se/docs/CVE-2026-8924.html"
        },
        "details": "A flaw in curl\u2019s cookie parsing logic allows a malicious HTTP server to set\n\"super cookies\" that bypass the Public Suffix List check. This enables an\nattacker-controlled origin to inject cookies that curl subsequently scopes and\ntransmits to unrelated third-party domains.",
        "id": "CURL-CVE-2026-8924",
        "modified": "2026-09-07T10:34:51.00Z",
        "published": "2026-06-24T08:00:00.00Z",
        "schema_version": "1.5.0",
        "summary": "trailing dot domain super cookie"
      }
    }
  },
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    "datePublished": "2026-07-03T06:15:04.646Z",
    "dateReserved": "2026-05-19T08:11:35.441Z",
    "dateUpdated": "2026-09-15T06:03:20.848Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-09-15",
      "epss": "0.0056",
      "percentile": "0.44987"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-13T00:01:12.000Z",
      "cve": "CVE-2026-8924",
      "id": "msrc_CVE-2026-8924",
      "initial_release_date": "2026-07-04T01:05:58.000Z",
      "product_status:known_affected": "2",
      "product_status:known_not_affected": "6",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "trailing dot domain super cookie",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-8924.json",
      "version": "4"
    },
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      "id": "CVE-2026-8924",
      "initial_release_date": "2026-07-03T06:15:04.646000+00:00",
      "product_status:fixed": "8",
      "product_status:known_affected": "30",
      "product_status:known_not_affected": "72",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "curl: curl: Cookie injection via malicious HTTP server using super cookies",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8924.json",
      "version": "3"
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      "aggregate_severity": "important",
      "current_release_date": "2026-08-31T13:45:03Z",
      "cve": "CVE-2026-8924",
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      "product_status:known_not_affected": "15",
      "product_status:recommended": "134",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-8924",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-8924.json",
      "version": "11"
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}

ubuntu-cve-2026-8924

Vulnerability from osv_ubuntu

Published

2026-06-24 14:00

Modified

2026-07-09 15:15

Summary

Details

A flaw in curl’s cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

Severity

9.1 (Critical)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2026-8924	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-8924	REPORT
	https://curl.se/L7HzKXisfJ/CVE-2026-8924.md	REPORT
	https://ubuntu.com/security/notices/USN-8487-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "curl",
            "binary_version": "7.47.0-1ubuntu2.19+esm16"
          },
          {
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          {
            "binary_name": "libcurl3-gnutls",
            "binary_version": "7.47.0-1ubuntu2.19+esm16"
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          {
            "binary_name": "libcurl3-nss",
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        "priority_reason": "Upstream defined this as low severity"
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          "events": [
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    },
    {
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        ],
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        "7.58.0-2ubuntu3.24+esm5",
        "7.58.0-2ubuntu3.24+esm7",
        "7.58.0-2ubuntu3.24+esm8"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
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          {
            "binary_name": "curl",
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        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "curl",
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        "7.68.0-1ubuntu2.22",
        "7.68.0-1ubuntu2.23",
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        "7.68.0-1ubuntu2.25",
        "7.68.0-1ubuntu2.25+esm2",
        "7.68.0-1ubuntu2.25+esm3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
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          {
            "binary_name": "libcurl3-gnutls",
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            "binary_name": "libcurl3-nss",
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          {
            "binary_name": "libcurl4",
            "binary_version": "7.81.0-1ubuntu1.25"
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        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@7.81.0-1ubuntu1.25?arch=source\u0026distro=jammy"
      },
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        {
          "events": [
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              "introduced": "0"
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      "versions": [
        "7.74.0-1.3ubuntu2",
        "7.74.0-1.3ubuntu3",
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        "7.81.0-1ubuntu1.7",
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        "7.81.0-1ubuntu1.14",
        "7.81.0-1ubuntu1.15",
        "7.81.0-1ubuntu1.16",
        "7.81.0-1ubuntu1.17",
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        "7.81.0-1ubuntu1.20",
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        "7.81.0-1ubuntu1.23",
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    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "curl",
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          {
            "binary_name": "libcurl3t64-gnutls",
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          },
          {
            "binary_name": "libcurl4t64",
            "binary_version": "8.5.0-2ubuntu10.10"
          }
        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@8.5.0-2ubuntu10.10?arch=source\u0026distro=noble"
      },
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        {
          "events": [
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        "8.2.1-1ubuntu3",
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        "8.5.0-2ubuntu10.7",
        "8.5.0-2ubuntu10.8",
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    },
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      "ecosystem_specific": {
        "availability": "No subscription required",
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          {
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            "binary_name": "libcurl3t64-gnutls",
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    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
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            "binary_name": "libcurl3t64-gnutls",
            "binary_version": "8.18.0-1ubuntu2.2"
          },
          {
            "binary_name": "libcurl4t64",
            "binary_version": "8.18.0-1ubuntu2.2"
          }
        ],
        "priority_reason": "Upstream defined this as low severity"
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "curl",
        "purl": "pkg:deb/ubuntu/curl@8.18.0-1ubuntu2.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.18.0-1ubuntu2.2"
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          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "8.14.1-2ubuntu1",
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        "8.18.0-1ubuntu1",
        "8.18.0-1ubuntu2",
        "8.18.0-1ubuntu2.1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw in curl\u2019s cookie parsing logic allows a malicious HTTP server to set \u0027super cookies\u0027 that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.",
  "id": "UBUNTU-CVE-2026-8924",
  "modified": "2026-07-09T15:15:43Z",
  "published": "2026-06-24T14:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-8924"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-8924"
    },
    {
      "type": "REPORT",
      "url": "https://curl.se/L7HzKXisfJ/CVE-2026-8924.md"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8487-1"
    }
  ],
  "related": [
    "USN-8487-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-8924"
  ]
}

VDE-2026-088

Vulnerability from csaf_mettlertoledogmbh - Published: 2026-08-20 10:00 - Updated: 2026-09-10 10:00

Summary

METTLER TOLEDO: LabX Standard and Enterprise Report on External Component Analysis - v21.4

Scope

65 vulnerabilities in this advisory, including CVE-2026-8924.

CVE-2026-8924

A flaw in curl's cookie parsing logic allows a malicious HTTP server to set 'super cookies' that bypass the Public Suffix List check. This enables an attacker-controlled origin to inject cookies that curl subsequently scopes and transmits to unrelated third-party domains.

9.1 (Critical)


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

Known affected: 1 product Recommended: 1 product

Open the full advisory

WID-SEC-W-2026-2065

Vulnerability from csaf_certbund - Published: 2026-06-24 22:00 - Updated: 2026-08-02 22:00

Summary

cURL: Mehrere Schwachstellen

Severity

Mittel

Scope

8 vulnerabilities in this advisory, including CVE-2026-8924.

CVE-2026-8924

Known affected: 8 products

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.

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-2026-8924 (GCVE-0-2026-8924)

ubuntu-cve-2026-8924

Vulnerability from osv_ubuntu

VDE-2026-088

WID-SEC-W-2026-2065

Tags

Sightings

Nomenclature