Debian dla-4729 : libnss3 - security update

critical Nessus Plugin ID 334146

Synopsis

The remote Debian host is missing a security-related update.

Description

The remote Debian 11 / 12 host has packages installed that are affected by a vulnerability as referenced in the dla-4729 advisory.

------------------------------------------------------------------------- Debian LTS Advisory DLA-4729-1 [email protected] https://www.debian.org/lts/security/ Jochen Sprickerhof August 10, 2026 https://wiki.debian.org/LTS
-------------------------------------------------------------------------

Package : nss Version : 3.61-1+deb11u7 2:3.87.1-1+deb12u4 CVE ID : CVE-2026-16389

Tomoya Nakanishi discovered a flaw in nss, the Mozilla Network Security Service library, which may result in execution of arbitrary code if a specially crafted certificate is processed.

For Debian 11 bullseye, this problem has been fixed in version 3.61-1+deb11u7.

For Debian 12 bookworm, this problem has been fixed in version 2:3.87.1-1+deb12u4.

We recommend that you upgrade your nss packages.

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

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 Attachment:
signature.asc Description: PGP signature

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

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

Solution

Upgrade the libnss3 packages.

Plugin Details

Severity: Critical

ID: 334146

File Name: debian_DLA-4729.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 8/10/2026

Updated: 8/10/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.16

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-16389

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:11.0, cpe:/o:debian:debian_linux:12.0, p-cpe:/a:debian:debian_linux:libnss3-dev, p-cpe:/a:debian:debian_linux:libnss3-tools, p-cpe:/a:debian:debian_linux:libnss3

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

Exploit Ease: No known exploits are available

Patch Publication Date: 8/10/2026

Vulnerability Publication Date: 7/21/2026

Reference Information

CVE: CVE-2026-16389

Detections

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