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

> Attackers can bypass HSTS protections in curl when multiple URLs are requested serially, potentially exposing sensitive data to cleartext transmission.

- **Severity:** Critical 9.1 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 23 Feb 2023
- **Updated:** 14 Oct 2026
- **Also known as:** ALPINE-CVE-2023-23914, AZL-13650, AZL-13654, AZL-34615, AZL-38043, CLEANSTART-2026-KS54681, CURL-CVE-2023-23914, DEBIAN-CVE-2023-23914, ECHO-f19d-0cd7-c916, GHSA-75qm-2q4j-qx6g, JLSEC-2026-402, ROOT-OS-DEBIAN-11-CVE-2023-23914, UBUNTU-CVE-2023-23914

## 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 (Cleartext Transmission of Sensitive Information)

## Which versions are affected by CVE-2023-23914?

It affects 8 products.


Products: Haxx Curl, Netapp Active Iq Unified Manager, Netapp Clustered Data Ontap, Netapp H300s Firmware, Netapp H410s Firmware, Netapp H500s Firmware, Netapp H700s Firmware, Splunk Universal Forwarder.

## 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](https://insights.sbomify.com/CVE-2026-19931/): Negotiate ambient user conn reuse (critical 9.8)
- [CVE-2026-10536](https://insights.sbomify.com/CVE-2026-10536/): HTTP/2 stream-dependency tree UAF (critical 9.8)
- [CVE-2026-11856](https://insights.sbomify.com/CVE-2026-11856/): cross-origin Digest auth state leak (critical 9.8)
- [CVE-2026-8925](https://insights.sbomify.com/CVE-2026-8925/): SASL double-free (critical 9.8)
- [CVE-2026-9079](https://insights.sbomify.com/CVE-2026-9079/): stale proxy password leak (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-23914 and fix it if it is affected.

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

Affected product: Haxx Curl. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-23914/ (Markdown: https://insights.sbomify.com/CVE-2023-23914/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-23914
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-23914
- OSV: https://osv.dev/vulnerability/CVE-2023-23914

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-23914/
Summaries are generated and may contain mistakes; the official description above is the record.