Medium · CVSS 5.9CVE-2026-116689

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

Answer in brief

CVE-2026-116689 records a Medium severity (CVSS 5.9) vulnerability in follow-redirects: Cross-realm sensitiveHeaders arrays are discarded and custom credentials can follow redirects. The current sources do not mark it as known exploited. The current feed maps follow-redirects/follow-redirects (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 27, 2026Updated Oct 27, 2026Source checked Oct 27, 2026First seen by HOL Oct 27, 2026Material review Oct 27, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 5.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps follow-redirects/follow-redirects (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
follow-redirects/follow-redirectsgeneric	>=1.16.0 <1.16.2	1.16.2

Recommended response

Check inventory. Check lockfiles and deployed manifests for follow-redirects/follow-redirects.
Review the reported fix. Update follow-redirects/follow-redirects to 1.16.2 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 27, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.