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Vulnerability record · CVE-2023-23914 · published 23 February 2023

CVE-2023-23914: Haxx curl cleartext transmission vulnerability

Haxx · Curl

A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality fail when multiple URLs are requested serially. Using its HSTS support, curl can be instructed to use HTTPS instead of usingan insecure clear-text HTTP step even when HTTP is provided in the URL. ThisHSTS mechanism would however surprisingly be ignored by subsequent transferswhen done on the same command line because the state would not be properlycarried on.

9.1 CVSS 3.1 Critical EPSS 0.86% · top 43.2% CWE-319 · Cleartext transmission
9.1CVSS 3.1 base score
0.86%EPSS exploitation probability, 30 days
NoNot in CISA KEV
8Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A cleartext transmission of sensitive information vulnerability exists in curl <v7.88.0 that could cause HSTS functionality fail when multiple URLs are requested serially. Using its HSTS support, curl can be instructed to use HTTPS instead of usingan insecure clear-text HTTP step even when HTTP is provided in the URL. ThisHSTS mechanism would however surprisingly be ignored by subsequent transferswhen done on the same command line because the state would not be properlycarried on.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

8 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://hackerone.com/reports/1813864 ExploitIssue Tracking
https://security.gentoo.org/glsa/202310-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20230309-0006/ Third Party Advisory
https://hackerone.com/reports/1813864 ExploitIssue Tracking
https://security.gentoo.org/glsa/202310-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20230309-0006/ Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2023-23914), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.