Waku: Open Redirect via `unstable_redirect` Helper (CVE-2026-49456) | HOL Guard CVE

Low severityCVE-2026-49456GHSA-43FC-V873-QW85

Waku: Open Redirect via `unstable_redirect` Helper

Answer in brief

CVE-2026-49456 records a Low severity vulnerability in Waku: Open Redirect via `unstable_redirect` Helper. The current sources do not mark it as known exploited. The current feed maps wakujs/waku (generic), waku (npm). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

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

Published Sep 3, 2026Updated Sep 3, 2026Source checked Sep 3, 2026First seen by HOL Jul 8, 2026Material review Sep 3, 2026

Upstream Advisory

Key facts

Risk: Low
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. 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 wakujs/waku (generic), waku (npm). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
wakujs/wakugeneric	< 1.0.0-beta.1	Not reported
wakunpm	<=1.0.0-beta.0	1.0.0-beta.1

Recommended response

Check inventory. Check lockfiles and deployed manifests for wakujs/waku, waku.
Review the reported fix. Update waku to 1.0.0-beta.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 3, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jul 8, 2026

Sources and claim methodology

Upstream source description

Waku is the minimal React framework. Prior to version 1.0.0-beta.1, the unstable_redirect() helper exported from waku/router/server (packages/waku/src/router/define-router.tsx:156–161) accepts an arbitrary string and reflects it unchanged into the HTTP Location response header with no URL validation, scheme restriction, or path-only enforcement. Any application that passes user-controlled input to this helper — the natural pattern documented in the JSDoc and official fixtures — is vulnerable to open redirect attacks. An attacker who convinces a victim to click a crafted link can silently redirect the browser to an arbitrary external domain, enabling phishing, credential harvesting, and OAuth token theft. Additionally, scheme-relative URLs (//evil.example/) bypass naive https?://-only allow-list filters that developers might add as ad-hoc mitigations. This issue has been patched in version 1.0.0-beta.1.

Quoted source text, attributed separately from HOL analysis.