---
id: CVE-2026-85676
title: >-
  Dub contains an open redirect vulnerability in the redir_url query parameter
  that is accepted on every short link without validation or domain allowlist
  enforcement
summary: >-
  Dub contains an open redirect vulnerability in the redir_url query parameter
  that is accepted on every short link without validation or domain allowlist
  enforcement. Attackers can append the redir_url parameter to any short link to
  redir…
severity: medium
cvss: 4.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N'
cwe:
  - CWE-601
vendor: dubinc
product: dub
affected:
  - dub <= 73415cf5e6be13ce9adb7ba5e97474307db34a17
published: '2026-09-04'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T17:17:44.980'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85676'
references:
  - url: 'https://github.com/dubinc/dub'
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/dubinc/dub/blob/73415cf5e6be13ce9adb7ba5e97474307db34a17/apps/web/lib/middleware/utils/get-final-url.ts
    label: disclosure@vulncheck.com
  - url: 'https://github.com/dubinc/dub/issues/4337'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/dub-open-redirect-via-unrestricted-redir-url-parameter
    label: disclosure@vulncheck.com
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85676.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-85676'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-85676'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00422
epssPercentile: 0.33924
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T19:20:39.606590Z'
ingestedAt: '2026-09-14T20:14:21.165Z'
---

## Overview

Dub contains an open redirect vulnerability in the redir_url query parameter that is accepted on every short link without validation or domain allowlist enforcement. Attackers can append the redir_url parameter to any short link to redirect visitors to arbitrary external URLs through the trusted Dub domain, bypassing destination blacklists and potentially enabling phishing attacks with link cloaking enabled.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-85676.json)