---
id: CVE-2026-107715
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 sends caller-supplied credential headers to a different
  host after an HTTP redirect. Mechanize#request_headers= is reapplied by
  Mechanize:…
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
vendor: mechanize
product: mechanize
affected:
  - mechanize < 2.14.1
patched:
  - mechanize 2.14.1
published: '2026-10-08'
updated: '2026-10-09'
sourceUpdated: '2026-10-09T14:17:18.870'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-107715'
references:
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52e4f
    label: security-advisories@github.com
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/94e0902867296be804f36eccbb47acf7d5018745
    label: security-advisories@github.com
  - url: >-
      https://github.com/sparklemotion/mechanize/commit/ac49abf2869297d83c3b11bbfb8b18e63b588c95
    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-2mwr-xjcg-37j7
    label: security-advisories@github.com
  - url: >-
      https://github.com/sparklemotion/mechanize/security/advisories/GHSA-2mwr-xjcg-37j7
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-2mwr-xjcg-37j7'
tags:
  - nvd
  - ghsa
  - rubygems
epss: 0.00395
epssPercentile: 0.3159
aliases:
  - GHSA-2mwr-xjcg-37j7
ecosystem: rubygems
ingestedAt: '2026-10-08T22:11:53.871Z'
---

## Overview

The Mechanize library is used for automating interaction with websites. Prior to 2.14.1, Mechanize sends caller-supplied credential headers to a different host after an HTTP redirect. Mechanize#request_headers= is reapplied by Mechanize::HTTP::Agent#request_add_headers even after Mechanize::HTTP::Agent#response_redirect strips per-request headers, and the protected header lists omit Proxy-Authorization and Cookie2. An attacker who controls a redirect target can capture bearer tokens or session cookies supplied through request_headers= or the per-request headers argument, while Mechanize#cookie_jar and Mechanize::HTTP::AuthStore are not affected. 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-2026-107715)

Affected packages:

- `mechanize < 2.14.1`

Patched in:

- `mechanize 2.14.1`

Source: https://github.com/advisories/GHSA-2mwr-xjcg-37j7