CVE-2026-111756 follow-redirects array-form headers bypass cross-origin credential stripping
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-111756?
CVE-2026-111756 is a high-severity vulnerability in follow-redirects, published on 20 Oct 2026.
Official description
follow-redirects is a Node.js HTTP and HTTPS client wrapper that automatically follows redirects. From version 1.16.0 to before version 1.16.1, follow-redirects removes sensitive credential headers (Authorization, Proxy-Authorization, Cookie, and any caller-declared sensitiveHeaders) before following a redirect that crosses to a different host or downgrades to a less secure protocol. The removal routine iterates the caller's headers container with for...in and matches header names against a filter. This assumes the headers container is a plain object keyed by header names. Node's underlying http.request, which follow-redirects is a drop-in replacement for, also accepts headers as an alternating array of names and values. For an array, for...in yields the numeric indices "0", "1", "2" and so on, which never match a header-name filter, so nothing is removed. An application that sends array-form headers and follows an attacker-controlled cross-origin redirect therefore forwards its Authorization, Cookie, and Proxy-Authorization headers verbatim to the attacker-controlled destination, with no error or warning. The sensitiveHeaders option added to fix CVE-2026-40895 / GHSA-r4q5-vmmm-2653 is equally ineffective, because it relies on the same helper. This is an unauthenticated confidentiality vulnerability: any remote server the victim application contacts can harvest the victim's credential headers by responding with a cross-origin redirect. This issue has been patched in version 1.16.1.
Which versions are affected by CVE-2026-111756?
2 open source packages ship an affected version, including follow-redirects.
| Package | Affected | Fixed in |
|---|---|---|
follow-redirects npm | From 1.16.0 | 1.16.1 |
follow-redirects npm | From 1.16.0 | 1.16.1 |
How do I fix CVE-2026-111756?
Upgrade follow-redirects to 1.16.1 or later.
Is CVE-2026-111756 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-111756 exists.
Sources
Also known as AZL-109829, AZL-110088, DEBIAN-CVE-2026-111756, ECHO-9da0-e484-8d88, GHSA-q3jh-wrc6-jgq8, MINI-2rvw-pfpv-53cf and 8 more.