Answer in brief
CVE-2026-109575 records a Critical severity (CVSS 9.8) vulnerability in CISA ADP Vulnrichment. The current sources do not mark it as known exploited. The current feed maps HAProxy/Data Plane API CE (generic), HAProxy/Data Plane API EE (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps HAProxy/Data Plane API CE (generic), HAProxy/Data Plane API EE (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| HAProxy/Data Plane API CEgeneric | >=2.2.0 <=2.9.28 || >=3.0.0 <=3.0.24 || >=3.1.0 <=3.2.16 || >=3.3.0 <=3.3.8 || >=3.4.0 <=3.4.3 | Not reported |
| HAProxy/Data Plane API EEgeneric | >=2.2.0-ee1 <=2.9.28-ee1 || >=3.0-ee <=3.0.24-ee1 || >=3.1-ee <=3.2.16-ee1 || >=3.3-ee <=3.3.8-ee1 || >=3.4-ee <=3.4.3-ee2 | Not reported |
Published upstream
Oct 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 12, 2026
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.
Quoted source text, attributed separately from HOL analysis.