CVE-2026-47874

Reactor Netty HTTP Server Denial of Service With Pipelined Requests

MEDIUM

5.3

CVSS Score

Published: August 26, 2026 at 11:49 PM UTC

Updated: September 2, 2026 at 04:02 PM UTC

2 products affected across 2 vendorsReactor NettyReactor Netty

Using Reactor Netty by Spring?

Get instant alerts when new vulnerabilities affect Reactor Netty - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM5.3

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

The vulnerability occurs when a client sends HTTP/1.1 pipelined requests over a single connection, causing the Reactor Netty HTTP server to consume an excessive amount of memory. 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-2026-47874

References (1)

Vendor Advisory

Source: cverecord

https://spring.io/security/cve-2026-47874

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: NONE
Availability: LOW

Vector?

Quick Info

StatusANALYZED

CWE

CWE-770

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card