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.

Metrics

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact High

Integrity Impact High

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact total

Affected Vendors & Products

Vendors Products
Curl
  • Curl

No data.

No data.

References
Link Providers
https://curl.se/docs/CVE-2026-8924.html cve-icon cve-icon
https://curl.se/docs/CVE-2026-8924.json cve-icon cve-icon
https://hackerone.com/reports/3733905 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-8924 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-8924 cve-icon
History

Wed, 08 Jul 2026 00:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-610

Tue, 07 Jul 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-565
References
Metrics threat_severity

None

 threat_severity

Moderate

Tue, 07 Jul 2026 08:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-610

Mon, 06 Jul 2026 22:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Mon, 06 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Mon, 06 Jul 2026 10:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Mon, 06 Jul 2026 04:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284

Sun, 05 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-284

Sun, 05 Jul 2026 12:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Sun, 05 Jul 2026 01:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20

Sat, 04 Jul 2026 12:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-639

Sat, 04 Jul 2026 01:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-639

Fri, 03 Jul 2026 21:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-613

Fri, 03 Jul 2026 13:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-20
CWE-613

Fri, 03 Jul 2026 11:15:00 +0000

Type Values Removed Values Added
First Time appeared Curl
Curl curl
Vendors & Products Curl
Curl curl

Fri, 03 Jul 2026 06:45:00 +0000

Type Values Removed Values Added
Description 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.
Title trailing dot domain super cookie
References
cve-icon MITRE

Status: PUBLISHED

Assigner: curl

Published: 2026-07-03T06:15:04.646Z

Updated: 2026-07-06T16:57:16.362Z

Reserved: 2026-05-19T08:11:35.441Z

Link: CVE-2026-8924

cve-icon Vulnrichment

Updated: 2026-07-06T16:57:12.247Z

cve-icon NVD

No data.

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-07-03T06:15:04Z

Links: CVE-2026-8924 - Bugzilla