---
id: CVE-2026-107714
title: The Mechanize library is used for automating interaction with websites
summary: >-
  The Mechanize library is used for automating interaction with websites. Prior
  to 2.14.1, Mechanize::HTTP::Agent#response_redirect treats redirects as
  same-origin when the host matches without consistently comparing scheme and
  port. A sam…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-200
  - CWE-319
  - CWE-522
published: '2026-10-08'
updated: '2026-10-08'
sourceUpdated: '2026-10-08T22:17:27.003'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107714'
references:
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f
    label: security-advisories@github.com
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/2f97fe358a91928e5e48221f2ec5cb50fa1a43ba
    label: security-advisories@github.com
  - url: 'https://github.com/sparklemotion/mechanize/pull/676'
    label: security-advisories@github.com
  - url: 'https://github.com/sparklemotion/mechanize/releases/tag/v2.14.1'
    label: security-advisories@github.com
  - url: >-
      https://github.com/sparklemotion/mechanize/security/advisories/GHSA-5jgv-wc2m-xv99
    label: security-advisories@github.com
tags:
  - nvd
ingestedAt: '2026-10-08T23:16:47.388Z'
---

## Overview

The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize::HTTP::Agent#response_redirect treats redirects as same-origin when the host matches without consistently comparing scheme and port. A same-host HTTPS-to-HTTP redirect can send Authorization and Cookie headers over cleartext, while a same-host redirect to another port can send a caller-supplied Cookie header to a different service. Cookies in Mechanize#cookie_jar remain scoped separately; the issue affects caller-supplied headers and can disclose credentials without affecting integrity or availability. This issue is fixed in version 2.14.1.

## Remediation

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