Detections
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Echo: io.netty:netty-handler: security update to 4.1.137.Final

critical Tenable Cloud Security Plugin ID 464609

Description

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

 - Netty is an asynchronous, event-driven network application framework. Prior to 4.1.137.Fina and
 4.2.17.Final, io.netty.handler.ssl.SslClientHelloHandler#decode checks the wrong offset before reading the
 four-byte TLS handshake header, so a ClientHello whose handshake header spans records can cause an
 IndexOutOfBoundsException and invoke select(ctx, null). This selects the default SslContext instead of the
 SNI-specific context. In deployments where per-SNI clientAuth=REQUIRE is the sole mutual TLS gate, the
 default SslContext uses clientAuth=NONE or clientAuth=OPTIONAL, and no application-layer certificate
 verification exists, an unauthenticated remote attacker can bypass the protected route's mutual TLS
 requirement. This issue is fixed in versions 4.1.137.Final and 4.2.17.Final. (CVE-2026-75595)

Solution

Update the io.netty:netty-handler library and its related packages to version 4.1.137.Final or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-75595

Plugin Details

Severity: Critical

ID: 464609

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.45

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-75595

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.1

Threat Score: 6.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 8/19/2026

Reference Information

CVE: CVE-2026-75595