Detections
Analytics

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

medium Tenable Cloud Security Plugin ID 463564

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 versions 4.1.136.Final and
 4.2.16.Final, Netty's HTTP/2-to-HTTP/1.x translation layer (`Http2StreamFrameToHttpObjectCodec` and
 `InboundHttp2ToHttpAdapter`) fails to deduplicate or validate `Host` headers when an HTTP/2 client
 supplies both the `:authority` pseudo-header and a literal `host` header in a single HEADERS frame. The
 translator maps `:authority` to `Host` and separately copies the literal `host` header, producing an
 `HttpRequest` object containing two `Host` headers with attacker-controlled differing values. This issue
 has been fixed in versions 4.1.136.Final and 4.2.16.Final. (CVE-2026-59900)

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-2026-59900

Plugin Details

Severity: Medium

ID: 463564

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

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-2026-59900

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

CVSS v4

Risk Factor: Medium

Base Score: 6.9

Threat Score: 2.7

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 9/28/2026

Vulnerability Publication Date: 7/22/2026

Reference Information

CVE: CVE-2026-59900