6.5

CVE-2023-46218: curl Improper Handling of Case Sensitivity

CVSS: 6.5v3.1MediumModified
AliasesALPINE-CVE-2023-46218SUSE-SU-2023:4713-1RHSA-2024:0434
Published 07-12-2023Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2023-46218 is a medium (CVSS 6.5) Improper Handling of Case Sensitivity vulnerability in curl. EPSS estimates a 1.69% chance of exploitation in the next 30 days, higher than 76.6% of scored vulnerabilities. 1 public exploit is recorded.

Overall risk
36/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.69%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference

Advisory lineage

Upstream 0 · Downstream 11 · Related 7
DLA-3692-1MGASA-2023-0345OPENSUSE-SU-2024:13509-1RHSA-2024:0428RHSA-2024:0585RHSA-2024:1316

Timeline

  1. 07-12-2023
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

8 scores · 8 sources · 1 version

EPSS trend

Probability

1.69%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

0.00 pp

From 1.69% on 18-09-2026

18-09-202618-10-2026
EPSS score
1.69%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

1 found
  • referenceUnverified

    Exploit Reference (hackerone.com)

    Maturity: unknown

Weaknesses

CWE · root cause

Affected systems

Redhat10 products
  • curl< 0:7.76.1-14.el9_0.11 | < 0:7.76.1-23.el9_2.6 | < 0:7.76.1-26.el9_3.3
  • curl-debuginfo< 0:7.76.1-14.el9_0.11 | < 0:7.76.1-23.el9_2.6 | < 0:7.76.1-26.el9_3.3
  • curl-debugsource< 0:7.76.1-14.el9_0.11 | < 0:7.76.1-23.el9_2.6 | < 0:7.76.1-26.el9_3.3
  • curl-minimal< 0:7.76.1-14.el9_0.11 | < 0:7.76.1-23.el9_2.6 | < 0:7.76.1-26.el9_3.3
  • curl-minimal-debuginfo< 0:7.76.1-14.el9_0.11 | < 0:7.76.1-23.el9_2.6 | < 0:7.76.1-26.el9_3.3
Chainguard2 products
  • curl< 8.5.0-r0
  • libcurl4All versions (No fix recorded)
Suse2 products
  • curl&distro=SUSE Linux Enterprise Micro 5.1< 7.66.0-150200.4.63.1
  • curl&distro=SUSE Linux Enterprise Micro 5.2< 7.66.0-150200.4.63.1
Wolfi2 products
  • curl< 8.5.0-r0
  • libcurl4All versions (No fix recorded)
Alpine1 product
  • curl≥ 7.46.0, < 8.5.0-r0
Curl1 product
Debian1 product
  • curl< 8.5.0-1 | < 7.74.0-1.3+deb11u11 | < 7.88.1-10+deb12u5
Fedoraproject1 product
Haxx1 product
  • curl≥ 7.46.0, ≤ 8.4.0
Ubuntu1 product
  • curl< 7.68.0-1ubuntu2.21 | < 7.81.0-1ubuntu1.15 | < 7.47.0-1ubuntu2.19+esm11 | < 7.58.0-2ubuntu3.24+esm3

10 vendors · 22 products

References

32 links
Show all 32 references