Insertion of Sensitive Information Into Sent Data Affecting mechanize package, versions <2.14.1
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-RUBY-MECHANIZE-21716943
- published26 Oct 2026
- disclosed8 Oct 2026
- creditflavorjones
Introduced: 8 Oct 2026
NewCVE-2026-107714 (opens in a new tab)How to fix?
Upgrade mechanize to version 2.14.1 or higher.
Overview
Affected versions of this package are vulnerable to Insertion of Sensitive Information Into Sent Data via the response_redirect method in Mechanize::HTTP::Agent. When Mechanize follows a redirect to the same host with a different scheme, it sends Authorization and Cookie headers over the unencrypted connection; a redirect to a different port on the same host can also send a caller-supplied Cookie header to the service listening there. A network observer can capture credentials sent over HTTP, and the service on the other port receives the cookie.
Notes
- The redirect step requires Mechanize to follow redirects (
redirect_okenabled); withredirect_ok = false, this redirect path is not reached.
Workarounds
- Set
Mechanize#redirect_ok = falseand handle redirects explicitly, checking the target’s scheme and port before carrying credentials; this prevents credentials or cookies from being forwarded across those redirect changes.