Information disclosure in Sparklemotion Mechanize
CVE-2026-107714
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.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Sparklemotion Mechanize — versions < 2.15.0
Weakness classification (CWE)
References
- github.com/sparklemotion/mechanize/security/advisories/GHSA-5jgv-wc2m-xv99
- github.com/sparklemotion/mechanize/pull/676
- github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba2cecf52…
- github.com/sparklemotion/mechanize/commit/2f97fe358a91928e5e48221f2ec5cb50fa1a4…
- github.com/sparklemotion/mechanize/releases/tag/v2.14.1
Frequently asked questions
- What is CVE-2026-107714?
- CVE-2026-107714 is a medium-severity vulnerability in Sparklemotion Mechanize, classified under Information Disclosure. CVSS score: 5.9/10. Published 2026-10-08.
- How severe is CVE-2026-107714?
- Medium severity. CVSS v3 base score is 5.9 out of 10.