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Echo: io.netty:netty-codec-http2: security update to 4.1.135.Final

medium Tenable Self-Hosted Container Security Plugin ID 460989

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - Netty is a network application framework for development of protocol servers and clients. Prior to
 versions 4.1.135.Final and 4.2.15.Final, DefaultHttp2Connection.DefaultEndpoint initialises
 maxActiveStreams/maxStreams to Integer.MAX_VALUE, and Http2Settings never inserts
 SETTINGS_MAX_CONCURRENT_STREAMS by default (Http2Settings.java:305-307 only clamps a user-supplied value).
 Unless the application explicitly calls initialSettings().maxConcurrentStreams(n), a Netty HTTP/2 server
 advertises no limit and enforces none locally. Each open stream allocates a DefaultStream object,
 PropertyMap slots, flow-controller state and IntObjectHashMap entry; with ~2^30 permissible odd stream IDs
 a single TCP connection can create hundreds of thousands of long-lived stream objects. This is also the
 precondition for CVE-2023-44487-style Rapid-Reset amplification, where the absence of a low concurrent cap
 multiplies backend work. Versions 4.1.135.Final and 4.2.15.Final patch the issue. (CVE-2026-47244)

Solution

Update the io.netty:netty-codec-http2 library and its related packages to version 4.1.135.Final or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-47244

Plugin Details

Severity: Medium

ID: 460989

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/3/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

CVSS Score Source: CVE-2026-47244

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.6

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 6/8/2026

Reference Information

CVE: CVE-2026-47244