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Echo: mbedtls: security update to 3.6.6

critical Tenable Self-Hosted Container Security Plugin ID 459138

Description

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

 - An issue was discovered in Mbed TLS 3.5.x and 3.6.x through 3.6.5 and TF-PSA-Crypto 1.0. There is a lack
 of contributory behavior in FFDH due to improper input validation. Using finite-field Diffie-Hellman, the
 other party can force the shared secret into a small set of values (lack of contributory behavior). This
 is a problem for protocols that depend on contributory behavior (which is not the case for TLS). The
 attack can be carried by the peer, or depending on the protocol by an active network attacker (person in
 the middle). (CVE-2026-34872)

Solution

Update the mbedtls library and its related packages to version 3.6.6 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-34872

Plugin Details

Severity: Critical

ID: 459138

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.28

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-2026-34872

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/27/2026

Vulnerability Publication Date: 4/1/2026

Reference Information

CVE: CVE-2026-34872