Detections
Analytics

Echo: h2: security update to 4.4.1

medium Tenable Cloud Security Plugin ID 458084

Description

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

 - h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept
 request header blocks containing more than one Host header, and forward every Host header to the consuming
 application. Where the consumer downgrades HTTP/2 to HTTP/1.1, the resulting request carries two Host
 header lines, providing a request smuggling primitive. This issue is fixed in version 4.4.1.
 (CVE-2026-71554)

Solution

Update the h2 library and its related packages to version 4.4.1 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-71554

Plugin Details

Severity: Medium

ID: 458084

Version: Revision 1.1

Type: Local

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: 3.2

Percentile: 50.91

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.9

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

CVSS Score Source: CVE-2026-71554

CVSS v3

Risk Factor: Medium

Base Score: 5.3

Temporal Score: 4.8

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

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

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 8/13/2026

Vulnerability Publication Date: 8/6/2026

Reference Information

CVE: CVE-2026-71554