---
id: CVE-2026-107399
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 applies no origin trust boundary in
  Mechanize::HTTP::Agent#response_follow_meta_refresh when
  Mechanize#follow_meta_refresh is enabled. A p…
severity: medium
cvss: 6.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N'
cwe:
  - CWE-200
  - CWE-522
  - CWE-201
vendor: mechanize
product: mechanize
affected:
  - mechanize < 2.14.1
patched:
  - mechanize 2.14.1
published: '2026-10-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T02:16:57.060'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107399'
references:
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f
    label: security-advisories@github.com
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/84c74df87d15f5d119df268ba6aa79bc1e16a2c3
    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-c6rp-p8xm-4q9f
    label: security-advisories@github.com
  - url: 'https://github.com/advisories/GHSA-c6rp-p8xm-4q9f'
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107399.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-107399'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2548278'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-107399'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107399'
tags:
  - nvd
  - ghsa
  - rubygems
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00362
epssPercentile: 0.29907
aliases:
  - GHSA-c6rp-p8xm-4q9f
ecosystem: rubygems
ingestedAt: '2026-10-08T22:11:53.871Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-10-14T01:21:27.011574Z'
scores:
  nvd: 6.8
  vendor: 5.9
---

## Overview

The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize applies no origin trust boundary in Mechanize::HTTP::Agent#response_follow_meta_refresh when Mechanize#follow_meta_refresh is enabled. A page containing a meta refresh to another origin causes headers configured through Mechanize#request_headers= to be reapplied to the refresh request, allowing an attacker who controls content in the crawl to capture bearer tokens or session cookies. The default configuration is not affected because follow_meta_refresh is false, and the exposure is limited to caller-supplied default headers. This issue is fixed in version 2.14.1.

## Remediation

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

## Package advisory (CVE-2026-107399)

Affected packages:

- `mechanize < 2.14.1`

Patched in:

- `mechanize 2.14.1`

Source: https://github.com/advisories/GHSA-c6rp-p8xm-4q9f

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat 3scale API Management Platform 2 · no fix planned: Red Hat 3scale API Management Platform 2 · updated 2026-10-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-107399.json)