Detections
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Echo: mbedtls: security update to 3.6.6

high Tenable Self-Hosted Container Security Plugin ID 461447

Description

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

 - An issue was discovered in Mbed TLS 3.x before 3.6.6. An out-of-bounds read vulnerability in
 mbedtls_ccm_finish() in library/ccm.c allows attackers to obtain adjacent CCM context data via invocation
 of the multipart CCM API with an oversized tag_len parameter. This is caused by missing validation of the
 tag_len parameter against the size of the internal 16-byte authentication buffer. The issue affects the
 public multipart CCM API in Mbed TLS 3.x, where mbedtls_ccm_finish() can be invoked directly by
 applications. In Mbed TLS 4.x versions prior to the fix, the same missing validation exists in the
 internal implementation; however, the function is not exposed as part of the public API. Exploitation
 requires application-level invocation of the multipart CCM API. (CVE-2026-34876)

Solution

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

See Also

https://advisory.echohq.com/cve/CVE-2026-34876

Plugin Details

Severity: High

ID: 461447

Version: Revision 1.1

Type: Local

Published: 10/2/2026

Updated: 10/2/2026

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.9

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2026-34876

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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: 4/2/2026

Reference Information

CVE: CVE-2026-34876