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Date: Wed, 27 Mar 2024 07:58:00 +0100 (CET)
From: Daniel Stenberg <>
To: curl security announcements -- curl users <>,, libcurl hacking <>,
Subject: [SECURITY ADVISORY] curl: CVE-2024-2004: Usage of disabled

Usage of disabled protocol

Project curl Security Advisory, March 27 2024 -


When a protocol selection parameter option disables all protocols without
adding any then the default set of protocols would remain in the allowed set
due to an error in the logic for removing protocols. The below command would
perform a request to with a plaintext protocol which has been
explicitly disabled.

     curl --proto -all,-http

The flaw is only present if the set of selected protocols disables the entire
set of available protocols, in itself a command with no practical use and
therefore unlikely to be encountered in real situations. The curl security team
has thus assessed this to be low severity bug.


The Common Vulnerabilities and Exposures (CVE) project has assigned the name
CVE-2024-2004 to this issue.

CWE-115: Misinterpretation of Input

Severity: Low


- Affected versions: curl 7.85.0 to and including 8.6.0
- Not affected versions: curl < 7.85.0 and >= 8.7.0
- Introduced-in:

libcurl is used by many applications, but not always advertised as such!

This flaw is also accessible using the curl command line tool.


Starting in curl 8.7.0, the set of allowed protocols is cleared before the set
of disabled protocols is inspected, leaving all protocols disabled even in the
error path.

- Fixed-in:


  A - Upgrade curl to version 8.7.0

  B - Apply the patch to your local version

  C - Inspect any scripts which constructs curl commands with `--proto` options
      to make sure there is at least one allowed protocol


This issue was reported to the curl project on February 15, 2024. We contacted
distros@...nwall on March 19, 2024.

curl 8.7.0 was released on March 27 2024 around 07:00 UTC, coordinated with
the publication of this advisory.

The curl security team is not aware of any active exploits using this


- Reported-by: Dan Fandrich
- Patched-by: Daniel Gustafsson

Thanks a lot!



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