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Debian dla-4551 : libmbedcrypto3 - security update

medium Nessus Plugin ID 310420

Synopsis

The remote Debian host is missing one or more security-related updates.

Description

The remote Debian 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-4551 advisory.

 - ------------------------------------------------------------------------- Debian LTS Advisory DLA-4551-1 [email protected] https://www.debian.org/lts/security/ Andrej Shadura April 27, 2026 https://wiki.debian.org/LTS
 - -------------------------------------------------------------------------

 Package : mbedtls Version : 2.16.9-0.1+deb11u4 CVE ID : CVE-2025-59438 CVE-2026-34871

 CVE-2025-59438

 Observable Timing Discrepancy. The presence of a padding error could leak through timings, enabling the attacker to recover information about the secret.

 CVE-2026-34871

 On systems where getrandom() was not available, /dev/urandom would be used a fallback instead of /dev/random.

 For Debian 11 bullseye, these problems have been fixed in version 2.16.9-0.1+deb11u4.

 We recommend that you upgrade your mbedtls packages.

 For the detailed security status of mbedtls please refer to its security tracker page at:
 https://security-tracker.debian.org/tracker/mbedtls

 Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade the libmbedcrypto3 packages.

See Also

https://security-tracker.debian.org/tracker/source-package/mbedtls

https://security-tracker.debian.org/tracker/CVE-2025-59438

https://security-tracker.debian.org/tracker/CVE-2026-34871

https://packages.debian.org/source/bullseye/mbedtls

Plugin Details

Severity: Medium

ID: 310420

File Name: debian_DLA-4551.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 4/27/2026

Updated: 4/27/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.0

CVSS v2

Risk Factor: Medium

Base Score: 5.6

Temporal Score: 4.1

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

CVSS Score Source: CVE-2026-34871

CVSS v3

Risk Factor: Medium

Base Score: 6.7

Temporal Score: 5.8

Vector: CVSS:3.0/AV:L/AC:H/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

CPE: p-cpe:/a:debian:debian_linux:libmbedtls12, p-cpe:/a:debian:debian_linux:libmbedx509-0, cpe:/o:debian:debian_linux:11.0, p-cpe:/a:debian:debian_linux:libmbedtls-doc, p-cpe:/a:debian:debian_linux:libmbedcrypto3, p-cpe:/a:debian:debian_linux:libmbedtls-dev

Required KB Items: Host/local_checks_enabled, Host/Debian/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 4/27/2026

Vulnerability Publication Date: 10/21/2025

Reference Information

CVE: CVE-2025-59438, CVE-2026-34871