Mechanize sends credential headers to a different scheme or port after a redirect

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107714
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-08 22:17:27 UTC
Updated2026-10-08 22:17:27 UTC
DescriptionThe 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.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Problem Types: CWE-200 | CWE-319 | CWE-522 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-319 CWE-319: Cleartext Transmission of Sensitive Information | CWE-522 CWE-522: Insufficiently Protected Credentials

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sparklemotion Mechanize affected < 2.15.0 Not specified

References

ReferenceSourceLinkTags
github.com/sparklemotion/mechanize/pull/676 [email protected] github.com
github.com/sparklemotion/mechanize/commit/2f97fe358a91928e5e48221f2ec5cb... [email protected] github.com
github.com/sparklemotion/mechanize/releases/tag/v2.14.1 [email protected] github.com
github.com/sparklemotion/mechanize/security/advisories/GHSA-5jgv-wc2m-xv99 [email protected] github.com
github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba... [email protected] github.com
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