CVE-2023-46218

Publication date 6 December 2023

Last updated 4 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
curl	23.10 mantic	Fixed 8.2.1-1ubuntu3.2
	23.04 lunar	Fixed 7.88.1-8ubuntu2.4
	22.04 LTS jammy	Fixed 7.81.0-1ubuntu1.15
	20.04 LTS focal	Fixed 7.68.0-1ubuntu2.21
	18.04 LTS bionic	Fixed 7.58.0-2ubuntu3.24+esm3
	16.04 LTS xenial	Fixed 7.47.0-1ubuntu2.19+esm11
	14.04 LTS trusty	Not affected

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
curl	Upstream: 2b0994c

Severity score breakdown

Parameter	Value
Base score	6.5 · Medium
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N