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Vulnerabilities CVE-2026-40895

CVE-2026-40895

Medium
Open
TLP:CLEAR

follow-redirects: Custom Authentication Headers Leaked to Cross-Domain Redirect Targets

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Description

follow-redirects is an open source, drop-in replacement for Node's `http` and `https` modules that automatically follows redirects. Prior to 1.16.0, when an HTTP request follows a cross-domain redirect (301/302/307/308), follow-redirects only strips authorization, proxy-authorization, and cookie headers (matched by regex at index.js). Any custom authentication header (e.g., X-API-Key, X-Auth-Token, Api-Key, Token) is forwarded verbatim to the redirect target. This vulnerability is fixed in 1.16.0.

Details

CVSS Score
6.9
EPSS Score
0.49%

39.5th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
Confidence
90%
Published
Apr 21, 2026
Last Modified
Aug 13, 2026
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