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[ CVE-2026-107715 · Published 8 Oct 2026 ]

Mechanize sends credential headers to another host after an HTTP redirect

CVSS 6.8 EPSS <1%Fix available

[ Why it matters ]Priority signals

  • Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

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.

[ Fixes ]Fixes and patches

  • mechanize 2.14.1Fixed version · GitHub Advisories · rubygems package mechanize: upgrade to 2.14.1 or later (affected < 2.14.1)

[ Packages ]Affected open-source packages

[ References ]References