Detections
Analytics

Echo: io.netty:netty-codec-http2: security update to 4.1.136.Final

high Tenable Cloud Security Plugin ID 465932

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. In versions
 4.2.0.Final through 4.2.15.Final and 4.1.0.Final through 4.1.135.Final, a remote unauthenticated peer can
 leak one direct `ByteBuf` per HTTP/2 `DATA` frame in applications that enable HTTP/2 content decompression
 via `DelegatingDecompressorFrameListener`. When a `DATA` frame is processed for a stream whose
 decompressor has already been closed, `Http2Decompressor.decompress(...)` calls
 `decompressor.writeInbound(data.retain())` and does not release the retained buffer on the error path,
 eventually exhausting direct memory and crashing the JVM. This issue is fixed in versions 4.1.136.Final
 and 4.2.16.Final. (CVE-2026-56819)

Solution

Update the io.netty:netty-codec-http2 library and its related packages to version 4.1.136.Final or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-56819

Plugin Details

Severity: High

ID: 465932

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: 23.74

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-56819

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.7

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:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 7/21/2026

Reference Information

CVE: CVE-2026-56819