This flaw allows a malicious HTTP server to set "super cookies" in curl that
are then passed back to more origins than what is otherwise allowed or
possible. This allows a site to set cookies that then would get sent to
different and unrelated sites and domains.
It could do this by exploiting a mixed case flaw in curl's function that
verifies a given cookie domain against the Public Suffix List (PSL). For
example a cookie could be set with `domain=co.UK` when the URL used a lower
case hostname `curl.co.uk`, even though `co.uk` is listed as a PSL domain.
Metrics
Affected Vendors & Products
References
History
Tue, 12 May 2026 12:15:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
ssvc
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Tue, 12 May 2026 11:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| References |
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Wed, 16 Jul 2025 13:45:00 +0000
| Type | Values Removed | Values Added |
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| Metrics |
epss
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epss
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Mon, 30 Jun 2025 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-178 |
Thu, 13 Feb 2025 17:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | This flaw allows a malicious HTTP server to set "super cookies" in curl that are then passed back to more origins than what is otherwise allowed or possible. This allows a site to set cookies that then would get sent to different and unrelated sites and domains. It could do this by exploiting a mixed case flaw in curl's function that verifies a given cookie domain against the Public Suffix List (PSL). For example a cookie could be set with `domain=co.UK` when the URL used a lower case hostname `curl.co.uk`, even though `co.uk` is listed as a PSL domain. | This flaw allows a malicious HTTP server to set "super cookies" in curl that are then passed back to more origins than what is otherwise allowed or possible. This allows a site to set cookies that then would get sent to different and unrelated sites and domains. It could do this by exploiting a mixed case flaw in curl's function that verifies a given cookie domain against the Public Suffix List (PSL). For example a cookie could be set with `domain=co.UK` when the URL used a lower case hostname `curl.co.uk`, even though `co.uk` is listed as a PSL domain. |
Status: PUBLISHED
Assigner: hackerone
Published:
Updated: 2026-05-12T10:52:38.819Z
Reserved: 2023-10-19T01:00:12.854Z
Link: CVE-2023-46218
Updated: 2024-08-02T20:37:40.148Z
Status : Modified
Published: 2023-12-07T01:15:07.160
Modified: 2026-05-12T11:16:14.360
Link: CVE-2023-46218