CVE-2023-23914 Security feature bypass in https://github.com/curl/curl

What is CVE-2023-23914?

CVE-2023-23914 is a critical vulnerability in Haxx Curl, published on 23 Feb 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-319

Which versions are affected by CVE-2023-23914?

It affects 8 products.

Products include Haxx Curl, Netapp Active Iq Unified Manager, Netapp Clustered Data Ontap, Netapp H300s Firmware, Netapp H410s Firmware, Netapp H500s Firmware and 2 more.

How do I fix CVE-2023-23914?

Upgrade to a fixed version.

Is CVE-2023-23914 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-23914 exists.

Other vulnerabilities in Haxx Curl

• CVE-2026-19931 Negotiate ambient user conn reuse Critical 9.8
• CVE-2026-10536 HTTP/2 stream-dependency tree UAF Critical 9.8
• CVE-2026-11856 cross-origin Digest auth state leak Critical 9.8
• CVE-2026-8925 SASL double-free Critical 9.8
• CVE-2026-9079 stale proxy password leak Critical 9.8

All Haxx Curl vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ALPINE-CVE-2023-23914, AZL-13650, AZL-13654, AZL-34615, AZL-38043, CLEANSTART-2026-KS54681 and 7 more.