CVE-2023-46218

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2023-12-07. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Elevated
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

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.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
—
EPSS
74.6%
KEV
Not listed

Published

December 7, 2023

Last Modified

July 14, 2026

Advisory Details (7)

Auto-updated Jul 14, 2026
Patch available.
generic

NetApp Product Security

https://security.netapp.com/advisory/ntap-20240125-0007/
generic

[SECURITY] [DSA 5587-1] curl security update

https://www.debian.org/security/2023/dsa-5587
generic Patch Available

[SECURITY] [DLA 3692-1] curl security update

https://lists.debian.org/debian-lts-announce/2023/12/msg00015.html
generic

[SECURITY] Fedora 38 Update: curl-8.0.1-6.fc38 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UOGXU25FMMT2X6UUITQ7EZZYMJ42YWWD/
generic

[SECURITY] Fedora 39 Update: curl-8.2.1-4.fc39 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3ZX3VW67N4ACRAPMV2QS2LVYGD7H2MVE/
generic

curl - cookie mixed case PSL bypass - CVE-2023-46218

https://curl.se/docs/CVE-2023-46218.html
generic

HackerOne

https://hackerone.com/reports/2212193

Vendor Advisories for CVE-2023-46218(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(14)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibcurl4-openssl-dev (7.47.0-1ubuntu2.19+esm11) @ xenial2026-05-22ubuntu
ubuntulibcurl4-openssl-dev (8.2.1-1ubuntu3.2) @ mantic2026-05-22ubuntu
redhatopenshift-logging/vector-rhel9:v0.28.1-562024-05-01redhat
redhatopenshift-logging/vector-rhel8:v0.21.0-1272024-05-01redhat
redhatopenshift-logging/vector-rhel8:v0.28.1-572024-05-01redhat
redhatcurl-0:7.61.1-33.el8_9.52024-04-02redhat
redhatodf4/rook-ceph-rhel9-operator:v4.15.0-1032024-03-19redhat
redhatjbcs-httpd24-curl-0:8.6.0-3.el7jbcs2024-03-18redhat
redhatjbcs-httpd24-curl2024-03-18redhat
redhatcurl-0:7.76.1-26.el9_3.32024-03-05redhat
redhatcurl-0:7.61.1-30.el8_8.92024-01-30redhat
redhatcurl-0:7.61.1-22.el8_6.122024-01-25redhat
redhatcurl-0:7.76.1-14.el9_0.112024-01-25redhat
redhatcurl-0:7.76.1-23.el9_2.62024-01-25redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(14)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 11× in last 7d / 45× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 122 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2023-46218?
CVE-2023-46218 is a medium vulnerability published on December 7, 2023. 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…
When was CVE-2023-46218 disclosed?
CVE-2023-46218 was first published in the National Vulnerability Database on December 7, 2023, with the most recent update on July 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-46218 actively exploited?
CVE-2023-46218 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 74.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-46218?
CVE-2023-46218 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2023-46218?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-46218, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2023-46218

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