CVE-2026-47845

Reactor Netty HTTP Server may incorrectly evaluate proxy addresses

MEDIUM

5.3

CVSS Score

Published: August 26, 2026 at 11:28 PM UTC

Updated: September 4, 2026 at 07:26 PM UTC

2 products affected across 2 vendorsReactor NettyReactor Netty

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Severity

MEDIUM5.3

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

In specific scenarios, Reactor Netty HTTP Server may incorrectly evaluate the remote IP address when HAProxy Protocol is enabled. In order for this to happen, the application must be configured to use HAProxy Protocol. Reactor Netty 1.3.0 - 1.3.6 Reactor Netty 1.1.0 - 1.2.18 Reactor Netty 1.0.52 and earlier

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Reactor Netty · Broadcom

95%

v < 1.0.531.1.0 ≤ v < 1.2.191.3.0 ≤ v < 1.3.6.1

Affected range stops below 1.0.53, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.2.19, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.6.1, so it looks safe — our inference, not a vendor statement

Reactor Netty · Spring

60%

v ≤ 1.0.521.1.0 ≤ v ≤ 1.2.181.3.0 ≤ v ≤ 1.3.61.1.0 1.3.0

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://spring.io/security/cve-2026-47845

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-47845

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMvmware

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-290

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