---
id: CVE-2026-100390
title: >-
  Zoraxy versions 3.2.3 through 3.3.4 fail to properly parse IPv6 addresses in
  the RemoteAddr field when setting forwarded headers
summary: >-
  Zoraxy versions 3.2.3 through 3.3.4 fail to properly parse IPv6 addresses in
  the RemoteAddr field when setting forwarded headers. Unauthenticated attackers
  connecting over IPv6 can supply arbitrary X-Forwarded-For values to spoof
  their s…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cwe:
  - CWE-290
vendor: tobychui
product: zoraxy
affected:
  - zoraxy >= 3.2.3 <= 3.3.4
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T21:17:22.637'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-100390'
references:
  - url: 'https://github.com/tobychui/zoraxy'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/tobychui/zoraxy/blob/v3.3.4/src/mod/auth/sso/forward/util.go#L127-L142
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/tobychui/zoraxy/commit/56bb3e5abb83eae42a64203028d73a001d6096c4
    label: disclosure@vulncheck.com
  - url: 'https://github.com/tobychui/zoraxy/pull/1264'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/zoraxy-3.2.3-through-3.3.4-client-ip-spoofing-via-x-forwarded-for-ipv6
    label: disclosure@vulncheck.com
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-09-25T20:42:41.262458Z'
ingestedAt: '2026-09-25T21:19:40.142Z'
---

## Overview

Zoraxy versions 3.2.3 through 3.3.4 fail to properly parse IPv6 addresses in the RemoteAddr field when setting forwarded headers. Unauthenticated attackers connecting over IPv6 can supply arbitrary X-Forwarded-For values to spoof their source IP and bypass authorization provider IP-based access controls.

## Remediation

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