Reactor Netty WebSocket Client Leaks Credentials On Redirect (CVE-2026-47848) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-47848

Reactor Netty WebSocket Client Leaks Credentials On Redirect

Answer in brief

CVE-2026-47848 records a Unknown severity vulnerability in Reactor Netty WebSocket Client Leaks Credentials On Redirect. The current sources do not mark it as known exploited. The current feed maps Spring/Reactor Netty (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 Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

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 Spring/Reactor Netty (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Spring/Reactor Nettygeneric	1.3.0 \|\| 1.1.0 \|\| 0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Spring/Reactor Netty.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Source referencespring.io

Upstream source description

In specific scenarios involving WebSocket handshake redirects to a different origin, the Reactor Netty WebSocket client may leak credentials. In order for this to happen, the HTTP client must have been explicitly configured to follow redirects. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier

Quoted source text, attributed separately from HOL analysis.