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🛡️ CVE-2023-46218 — curl

🟡 CVSS 6.5 — Medium ⚠️ Exploit Public CWE-178 NVD
6.5
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity low, availability none.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

  • Attack vector: Network — reachable from anywhere that can route to the service.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: None — an unauthenticated stranger can try it.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: Low — limited, and the attacker does not choose what is affected.
  • Integrity impact: Low — limited, and the attacker does not choose what is affected.
  • Availability impact: None.

Weakness class

CVE-2023-46218 is classified as CWE-178: Improper Handling of Case Sensitivity. The product does not properly account for differences in case sensitivity when accessing or determining the properties of a resource, leading to inconsistent results.

Affected software

CVE-2023-46218 is recorded against 2 packages.

  • curl (from 7.46.0 up to 8.4.0)
  • fedora

Timeline and source

Published on 7 December 2023 and last revised on 17 June 2026. A public exploit is known to exist, which raises the urgency of patching considerably. A vendor advisory or fix has been published. Record sourced from NVD.

References

curl.se
hackerone.com
lists.debian.org
lists.fedoraproject.org
lists.fedoraproject.org
security.netapp.com
www.debian.org
curl.se
hackerone.com
lists.debian.org
lists.fedoraproject.org
lists.fedoraproject.org
security.netapp.com
www.debian.org
cert-portal.siemens.com
cert-portal.siemens.com
cert-portal.siemens.com
cert-portal.siemens.com

Other advisories for this package

curl has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-178: Improper Handling of Case Sensitivity) in other software:

CVE-2023-46218 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity MEDIUM
CVSS Score 6.5
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CWE CWE-178
Public Exploit ⚠️ Yes
Source NVD
Published 2023-12-07
Updated 2026-08-20
Modified 2026-06-17

Affected Packages

Software From version Fixed in
curl 7.46.0 8.4.0
fedora — —

References

Exploit, Issue Tracking, Patch, Third Party Advisory https://hackerone.com/reports/2212193
Exploit, Issue Tracking, Patch, Third Party Advisory https://hackerone.com/reports/2212193

Exploit Protection

Are you running curl?

CVE-2023-46218 carries CVSS 6.5 Medium rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.

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