MEDIUM

CVE-2023-46218

CVSS v3

6.5

MEDIUM

EPSS Score

1.7 %

exploit probability, as of 2026-10-19

CISA KEV

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

libcurlAlmaLinux:9all versions · fixed in 7.76.1-26.el9_3.3and 4 other packages
libcurlAlmaLinux:8all versions · fixed in 7.61.1-33.el8_9.5and 3 other packages

Vendor advisories

CVE-2023-46218 Red Hat Product Security643 products fixed · 2 known affected
curl: information disclosure by exploiting a mixed case flaw
puppet-agent as a component of Red Hat Satellite 6 · puppet-agent.src as a component of Red Hat Satellite 6
SSA-202008 Siemens ProductCERT11 known affected
SSA-202008: Multiple Vulnerabilities in Ruggedcom Rox Before V2.17.0
RUGGEDCOM ROX MX5000 · RUGGEDCOM ROX MX5000RE · RUGGEDCOM ROX RX1400
ICSA-25-162-05 CISA5 known affected
Siemens SIMATIC S7-1500 CPU family
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)
SSA-082556 Siemens ProductCERT5 known affected
SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) >= V3.1.5 · SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) >= V3.1.5 · SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) >= V3.1.5
ICSA-24-319-04 CISA1 known affected
Siemens SINEC NMS
SINEC NMS
SSA-331112 Siemens ProductCERT1 known affected
SSA-331112: Multiple Vulnerabilities in SINEC NMS Before V3.0 SP1
SINEC NMS

14 more advisories

Full record on NVD

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.

Technical details

Published: 2023-12-07

Frequently asked questions

What is CVE-2023-46218?

Is CVE-2023-46218 actively exploited?

Active exploitation of CVE-2023-46218 has not been confirmed. Its EPSS score was 1.7% on 2026-10-19, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-46218?

CVE-2023-46218 has a CVSS v3 base score of 6.5 (MEDIUM severity).

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