---
title: "CVE-2026-109575: HAProxy Data Plane API - Authentication Bypass"
description: "HAProxy Data Plane API 2.2.0 through 3.4.3 contains a broken authentication caused by process-global authentication logic improperly dropping security controls across multiple transport types, letting unauthenticated attackers bypass credentials and gain full API administrative access, exploit requires attacker to reach HTTP or UNIX management endpoints."
url: https://panop.io/threat-heartbeat/CVE-2026-109575/
---

# CVE-2026-109575 HAProxy Data Plane API - Authentication Bypass

HAProxy Data Plane API 2.2.0 through 3.4.3 contains a broken authentication caused by process-global authentication logic improperly dropping security controls across multiple transport types, letting unauthenticated attackers bypass credentials and gain full API administrative access, exploit requires attacker to reach HTTP or UNIX management endpoints.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.36% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-109575)

## Details

Type

Authentication Bypass

Impact

Broken Authentication

CVSS vector

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

Published

12 October 2026

Updated

15 October 2026

Weakness

[CWE-306](https://cwe.mitre.org/data/definitions/306.html)

## Vendor fix

Update to versions 3.4.4, 3.3.9, 3.2.17, 3.0.25, 2.9.29 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-109575](https://nvd.nist.gov/vuln/detail/CVE-2026-109575)
- [https://www.haproxy.com/documentation/haproxy-data-plane-api/community/changelog/#version-3.4](https://www.haproxy.com/documentation/haproxy-data-plane-api/community/changelog/#version-3.4)
- [https://github.com/haproxytech/dataplaneapi/commit/c3ae4e3ccff5490d44650565e445c4b15e8aff8c](https://github.com/haproxytech/dataplaneapi/commit/c3ae4e3ccff5490d44650565e445c4b15e8aff8c)
- [https://github.com/haproxytech/dataplaneapi/releases/tag/v3.4.4](https://github.com/haproxytech/dataplaneapi/releases/tag/v3.4.4)
- [https://www.haproxy.com/documentation/haproxy-data-plane-api/](https://www.haproxy.com/documentation/haproxy-data-plane-api/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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