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Echo: io.netty:netty-handler: security update to 4.1.135.Final

high Tenable Cloud Security Plugin ID 462797

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, SslClientHelloHandler.decode() reads the 24-bit TLS handshake
 length and, when the ClientHello does not fit in the first record, eagerly allocates
 `ctx.alloc().buffer(handshakeLength)` (line 161). The guard at line 140 is `handshakeLength >
 maxClientHelloLength && maxClientHelloLength != 0`, and the commonly-used SniHandler/AbstractSniHandler
 constructors (SniHandler(Mapping), SniHandler(AsyncMapping), AbstractSniHandler()) pass
 maxClientHelloLength=0 and handshakeTimeoutMillis=0, so the length guard is disabled and no timeout is
 scheduled. A 16 MiB request exceeds the default pooled chunk size and becomes a huge/unpooled allocation
 performed immediately. The buffer is retained in the handler until the channel closes. Versions
 4.1.135.Final and 4.2.15.Final patch the issue. (CVE-2026-45416)

Solution

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

See Also

https://advisory.echohq.com/cve/CVE-2026-45416

Plugin Details

Severity: High

ID: 462797

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: 3

Percentile: 23.72

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-45416

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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-2026-45416