Vulnerability Database

387,360

Total vulnerabilities in the database

CVE-2026-26081 — haproxy / haproxy

Improper Handling of Length Parameter Inconsistency

HAProxy Community Edition 3.0 through 3.3 before 3.3.3 lacks a length check for the NEW_TOKEN format. HAProxy Enterprise and ALOHA are also affected.

  • Published: Jul 20, 2026
  • Updated: Sep 18, 2026
  • CVE: CVE-2026-26081
  • Severity: Medium
  • Exploit:
  • CISA KEV:

CVSS v3:

  • Severity: Medium
  • Score: 4.8
  • AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L

CWEs:

Software Affected versions
haproxy / haproxy >= 3.0.0, < 3.0.16
haproxy / haproxy >= 3.1, < 3.1.14
haproxy / haproxy >= 3.2, < 3.2.12
haproxy / haproxy >= 3.3, < 3.3.3
haproxy / aloha >= 16.5.0.0, < 16.5.30
haproxy / aloha >= 17.0.0, < 17.0.18
haproxy / aloha >= 17.5.0, < 17.5.16
haproxy / haproxy_enterprise = 3.0r1-1.0.0-337.363
haproxy / haproxy_enterprise = 3.0r1-1.0.0-337.390
haproxy / haproxy_enterprise = 3.0r1-1.0.0-337.394
haproxy / haproxy_enterprise = 3.0r1-1.0.0-339.395
haproxy / haproxy_enterprise = 3.0r1-1.0.0-339.405
haproxy / haproxy_enterprise = 3.0r1-1.0.0-339.415
haproxy / haproxy_enterprise = 3.0r1-1.0.0-339.455
haproxy / haproxy_enterprise = 3.0r1-1.0.0-339.466
haproxy / haproxy_enterprise = 3.0r1-1.0.0-339.471
haproxy / haproxy_enterprise = 3.0r1-1.0.0-341.475
haproxy / haproxy_enterprise = 3.0r1-1.0.0-342.482
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.495
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.503
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.561
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.564
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.591
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.608
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.641
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.655
haproxy / haproxy_enterprise = 3.0r1-1.0.0-344.672
haproxy / haproxy_enterprise = 3.0r1-1.0.0-345.673
haproxy / haproxy_enterprise = 3.0r1-1.0.0-346.792
haproxy / haproxy_enterprise = 3.0r1-1.0.0-346.795
haproxy / haproxy_enterprise = 3.0r1-1.0.0-346.800
haproxy / haproxy_enterprise = 3.0r1-1.0.0-346.803
haproxy / haproxy_enterprise = 3.0r1-1.0.0-346.810
haproxy / haproxy_enterprise = 3.0r1-1.0.0-346.834
haproxy / haproxy_enterprise = 3.0r1-1.0.0-347.835
haproxy / haproxy_enterprise = 3.0r1-1.0.0-348.870
haproxy / haproxy_enterprise = 3.0r1-1.0.0-348.875
haproxy / haproxy_enterprise = 3.0r1-1.0.0-349.880
haproxy / haproxy_enterprise = 3.0r1-1.0.0-349.883
haproxy / haproxy_enterprise = 3.0r1-1.0.0-349.885
haproxy / haproxy_enterprise = 3.0r1-1.0.0-349.903
haproxy / haproxy_enterprise = 3.0r1-1.0.0-349.916
haproxy / haproxy_enterprise = 3.0r1-1.0.0-350.918
haproxy / haproxy_enterprise = 3.0r1-1.0.0-350.928
haproxy / haproxy_enterprise = 3.1r1-1.0.0-345.233
haproxy / haproxy_enterprise = 3.1r1-1.0.0-346.274
haproxy / haproxy_enterprise = 3.1r1-1.0.0-346.287
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.299
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.338
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.362
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.405
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.419
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.431
haproxy / haproxy_enterprise = 3.1r1-1.0.0-347.449
haproxy / haproxy_enterprise = 3.1r1-1.0.0-348.519
haproxy / haproxy_enterprise = 3.1r1-1.0.0-349.585
haproxy / haproxy_enterprise = 3.1r1-1.0.0-350.593
haproxy / haproxy_enterprise = 3.1r1-1.0.0-350.602
haproxy / haproxy_enterprise = 3.1r1-1.0.0-350.625
haproxy / haproxy_enterprise = 3.1r1-1.0.0-350.633
haproxy / haproxy_enterprise = 3.1r1-1.0.0-351.652
haproxy / haproxy_enterprise = 3.1r1-1.0.0-352.687
haproxy / haproxy_enterprise = 3.1r1-1.0.0-353.690
haproxy / haproxy_enterprise = 3.1r1-1.0.0-353.692
haproxy / haproxy_enterprise = 3.1r1-1.0.0-353.715
haproxy / haproxy_enterprise = 3.1r1-1.0.0-353.730
haproxy / haproxy_enterprise = 3.1r1-1.0.0-354.732
haproxy / haproxy_enterprise = 3.1r1-1.0.0-354.743
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.334
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.336
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.347
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.355
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.376
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.385
haproxy / haproxy_enterprise = 3.2r1-1.0.0-353.398
haproxy / haproxy_enterprise = 3.2r1-1.0.0-354.402
haproxy / haproxy_enterprise = 3.2r1-1.0.0-354.439
haproxy / haproxy_enterprise = 3.2r1-1.0.0-358.439
haproxy / haproxy_enterprise = 3.2r1-1.0.0-359.440
haproxy / haproxy_enterprise = 3.2r1-1.0.0-360.460
haproxy / haproxy_enterprise = 3.2r1-1.0.0-362.473
haproxy / haproxy_enterprise = 3.2r1-1.0.0-363.476
haproxy / haproxy_enterprise = 3.2r1-1.0.0-363.478
haproxy / haproxy_enterprise = 3.2r1-1.0.0-363.498
haproxy / haproxy_enterprise = 3.2r1-1.0.0-363.511
haproxy / haproxy_enterprise = 3.2r1-1.0.0-365.529
haproxy / haproxy_enterprise = 3.2r1-1.0.0-365.531
haproxy / haproxy_enterprise = 3.2r1-1.0.0-365.545
haproxy / haproxy >= 3.0, < 3.0.12

Frequently Asked Questions

A security vulnerability is a weakness in software, hardware, or configuration that can be exploited to compromise confidentiality, integrity, or availability. Many vulnerabilities are tracked as CVEs (Common Vulnerabilities and Exposures), which provide a standardized identifier so teams can coordinate patching, mitigation, and risk assessment across tools and vendors.

CVSS (Common Vulnerability Scoring System) estimates technical severity, but it doesn't automatically equal business risk. Prioritize using context like internet exposure, affected asset criticality, known exploitation (proof-of-concept or in-the-wild), and whether compensating controls exist. A "Medium" CVSS on an exposed, production system can be more urgent than a "Critical" on an isolated, non-production host.

A vulnerability is the underlying weakness. An exploit is the method or code used to take advantage of it. A zero-day is a vulnerability that is unknown to the vendor or has no publicly available fix when attackers begin using it. In practice, risk increases sharply when exploitation becomes reliable or widespread.

Recurring findings usually come from incomplete Asset Discovery, inconsistent patch management, inherited images, and configuration drift. In modern environments, you also need to watch the software supply chain: dependencies, containers, build pipelines, and third-party services can reintroduce the same weakness even after you patch a single host. Unknown or unmanaged assets (often called Shadow IT) are a common reason the same issues resurface.

Use a simple, repeatable triage model: focus first on externally exposed assets, high-value systems (identity, VPN, email, production), vulnerabilities with known exploits, and issues that enable remote code execution or privilege escalation. Then enforce patch SLAs and track progress using consistent metrics so remediation is steady, not reactive.

SynScan combines attack surface monitoring and continuous security auditing to keep your inventory current, flag high-impact vulnerabilities early, and help you turn raw findings into a practical remediation plan.