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Critical

CVE-2026-109575

Type: advisorySource: Official CVE List1 source record

In HAProxy Data Plane API 2.2.0 through 3.4.3 (and corresponding Enterprise Edition releases), Server.ConfigureAPI() has process-global authentication logic that improperly drops security controls across multiple transport types. When a TLS Certificate Authority (tls_ca) is configured and a numeric TLS port (tls_port) is specified, the application globally disables Basic authentication on its shared internal request handler. Because this handler is shared concurrently among HTTP, HTTPS, and UNIX domain socket listeners, and mutual TLS (mTLS) client certificate verification (tls.RequireAndVerifyClientCert) is enforced exclusively on the HTTPS server path, all other simultaneously active non-mTLS listeners fail open. Consequently, an unauthenticated attacker capable of reaching an affected HTTP or UNIX management endpoint can completely bypass credentials to gain full API administrative access. This allows unauthorized remote or local actors to read sensitive, cleartext HAProxy configuration data or replace the managed configuration entirely via the raw configuration endpoint. This has been fixed in versions 3.4.4, 3.3.9, 3.2.17, 3.0.25, 2.9.29, and their respective EE backports by migrating to a per-request TLS connection-state validation model.

Announced Source revision 1
Original source ↗

CVE-2026-109575

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-109575

Data Plane API EE

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Data Plane API CE

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "vendor": "HAProxy",
    "product": "Data Plane API EE",
    "versions": [
      {
        "status": "affected",
        "changes": [
          {
            "at": "2.9.29-ee1",
            "status": "unaffected"
          }
        ],
        "version": "2.2.0-ee1",
        "versionType": "custom",
        "lessThanOrEqual": "2.9.28-ee1"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.0.25-ee1",
            "status": "unaffected"
          }
        ],
        "version": "3.0-ee",
        "versionType": "custom",
        "lessThanOrEqual": "3.0.24-ee1"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.2.17-ee1",
            "status": "unaffected"
          }
        ],
        "version": "3.1-ee",
        "versionType": "custom",
        "lessThanOrEqual": "3.2.16-ee1"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.3.9-ee1",
            "status": "unaffected"
          }
        ],
        "version": "3.3-ee",
        "versionType": "custom",
        "lessThanOrEqual": "3.3.8-ee1"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.4.4-ee1",
            "status": "unaffected"
          }
        ],
        "version": "3.4-ee",
        "versionType": "custom",
        "lessThanOrEqual": "3.4.3-ee2"
      }
    ],
    "packageName": "dataplaneapi",
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://github.com/haproxytech/dataplaneapi",
    "vendor": "HAProxy",
    "product": "Data Plane API CE",
    "versions": [
      {
        "status": "affected",
        "changes": [
          {
            "at": "2.9.29",
            "status": "unaffected"
          }
        ],
        "version": "2.2.0",
        "versionType": "custom",
        "lessThanOrEqual": "2.9.28"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.0.25",
            "status": "unaffected"
          }
        ],
        "version": "3.0.0",
        "versionType": "custom",
        "lessThanOrEqual": "3.0.24"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.2.17",
            "status": "unaffected"
          }
        ],
        "version": "3.1.0",
        "versionType": "custom",
        "lessThanOrEqual": "3.2.16"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.3.9",
            "status": "unaffected"
          }
        ],
        "version": "3.3.0",
        "versionType": "custom",
        "lessThanOrEqual": "3.3.8"
      },
      {
        "status": "affected",
        "changes": [
          {
            "at": "3.4.4",
            "status": "unaffected"
          }
        ],
        "version": "3.4.0",
        "versionType": "custom",
        "lessThanOrEqual": "3.4.3"
      }
    ],
    "packageName": "dataplaneapi-ee",
    "defaultStatus": "unaffected"
  }
]
Related CVEs
CVE-2026-109575

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#20366 · Revision 1
Added to Heist Feed
Publisher date
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