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

medium Tenable Self-Hosted Container Security Plugin ID 459530

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, before reading the first request-line, `HttpObjectDecoder` skips
every byte for which `Character.isISOControl(b)` is `true` (0x00–0x1F and 0x7F) as well as all whitespace.
RFC 9112 §2.2 only asks servers to ignore empty CRLF lines preceding the request-line — a carefully scoped
robustness allowance intended to handle HTTP/1.0 POST workarounds. Silently absorbing NUL bytes, SOH, STX,
and other non-CRLF control characters goes significantly beyond this, and can be exploited for request-
boundary confusion in pipelined or multiplexed transports where a front-end component treats those bytes
differently. Versions 4.1.135.Final and 4.2.15.Final patch the issue. (CVE-2026-50020)

Solution

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

Plugin Details

Severity: Medium

ID: 459530

Version: Revision 1.1

Type: Local

Family: Echo Local Security Checks

Published: 10/2/2026

Updated: 10/5/2026

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:P/A:N

CVSS Score Source: CVE-2026-50020

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:L/A:N

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: 6/12/2026

Reference Information

CVE: CVE-2026-50020

Detections

Analytics