Reactor Netty WebSocket Client Leaks Credentials On Redirect

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-47848
StatePUBLISHED
Assignervmware
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-26 20:17:27 UTC
Updated2026-09-04 19:09:14 UTC
DescriptionIn 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

Risk And Classification

Primary CVSS: v3.1 6.1 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS: 0.001520000 probability, percentile 0.046690000 (date 2026-08-30)

Problem Types: CWE-601 | CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.1CNACVSS6.1MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Broadcom Reactor Netty All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Spring Reactor Netty affected 1.3.0 1.3.6 custom Not specified
CNA Spring Reactor Netty affected 1.1.0 1.2.18 custom Not specified
CNA Spring Reactor Netty affected 1.0.52 custom Not specified

References

ReferenceSourceLinkTags
spring.io/security/cve-2026-47848 [email protected] spring.io Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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