---
id: CVE-2026-62987
title: >-
  Fabio is an HTTP(S) and TCP router for deploying applications managed by
  consul
summary: >-
  Fabio is an HTTP(S) and TCP router for deploying applications managed by
  consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in
  proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded
  headers but omits the operator-…
severity: medium
cvss: 5.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N'
cwe:
  - CWE-290
  - CWE-348
vendor: fabiolb
product: fabio
affected:
  - 'fabio >= 1.6.6, < 1.7.2'
published: '2026-09-21'
updated: '2026-09-21'
sourceUpdated: '2026-09-21T17:17:38.340'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-62987'
references:
  - url: >-
      https://github.com/fabiolb/fabio/commit/240526a8004077edad4fb96d25b382bfc3901357
    label: security-advisories@github.com
  - url: 'https://github.com/fabiolb/fabio/releases/tag/v1.7.2'
    label: security-advisories@github.com
  - url: 'https://github.com/fabiolb/fabio/security/advisories/GHSA-fq95-v8xc-jm3v'
    label: security-advisories@github.com
tags:
  - nvd
  - cve.org
  - exploit-available
ingestedAt: '2026-09-21T16:49:07.876Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-09-21T18:03:21.616808Z'
---

## Overview

Fabio is an HTTP(S) and TCP router for deploying applications managed by consul. From 1.6.6 until 1.7.2, the CVE-2025-48865 fix in proxy/http_headers.go uses protectHeaders for a hardcoded set of forwarded headers but omits the operator-configured ClientIPHeader, TLSHeader, and RequestID names. In proxy/http_proxy.go, HTTPProxy.ServeHTTP calls addHeaders to set these trust headers before Go ReverseProxy processes the inbound Connection header, allowing an unauthenticated client to name and remove the configured headers before the request reaches the backend. Deployments that enable the corresponding proxy.header options can therefore lose client-IP, TLS-termination, or request-correlation signals used by backend authorization and auditing; the options are empty by default, and the hardcoded protected forwarded headers are unaffected. This issue is fixed in version 1.7.2.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.