Mechanize sends credential headers to another host after an HTTP redirect

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-107715
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 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

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

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

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N
3.1CNADECLARED6.8MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

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

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/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/commit/94e0902867296be804f36eccbb47ac... [email protected] github.com
github.com/sparklemotion/mechanize/pull/676 [email protected] github.com
github.com/sparklemotion/mechanize/releases/tag/v2.14.1 [email protected] github.com
github.com/sparklemotion/mechanize/commit/ac49abf2869297d83c3b11bbfb8b18... [email protected] github.com
github.com/sparklemotion/mechanize/commit/02a1235842d6eda8d4a5a3d8f13aba... [email protected] github.com
github.com/sparklemotion/mechanize/security/advisories/GHSA-2mwr-xjcg-37j7 [email protected] github.com
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