CVE-2026-47843

Reactor Netty may incorrectly route traffic due to DNS resolver reuse

LOW

3.7

CVSS Score

Published: August 26, 2026 at 07:22 PM UTC

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

2 products affected across 2 vendorsReactor NettyReactor Netty

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Severity

LOW3.7

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

In specific scenarios involving multiple clients with different DNS resolver configurations, Reactor Netty may incorrectly reuse a previously configured DNS resolver. 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-2026-47843

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-47843

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

3.7LOWvmware

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

Vector?

Quick Info

StatusANALYZED

CWE

NVD-CWE-noinfo

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