Debian dsa-6533 : firefox-esr - security update

critical Nessus Plugin ID 352262

Synopsis

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

Description

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6533 advisory.

- ------------------------------------------------------------------------- Debian Security Advisory DSA-6533-1 [email protected] https://www.debian.org/security/ Moritz Muehlenhoff September 30, 2026 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : firefox-esr CVE ID : CVE-2026-96869 CVE-2026-100756 CVE-2026-100757 CVE-2026-100758 CVE-2026-100759 CVE-2026-100760 CVE-2026-100762 CVE-2026-100765 CVE-2026-100766 CVE-2026-100767 CVE-2026-100769 CVE-2026-100770 CVE-2026-100771 CVE-2026-100772 CVE-2026-100773 CVE-2026-100774 CVE-2026-100775 CVE-2026-100776 CVE-2026-100777 CVE-2026-100778 CVE-2026-100779 CVE-2026-100780 CVE-2026-100781 CVE-2026-100782 CVE-2026-100783 CVE-2026-100784 CVE-2026-100785 CVE-2026-100786 CVE-2026-100787 CVE-2026-100788 CVE-2026-100789 CVE-2026-100790 CVE-2026-100791 CVE-2026-100792 CVE-2026-100794 CVE-2026-100797 CVE-2026-100798 CVE-2026-100800 CVE-2026-100801 CVE-2026-100803 CVE-2026-100806 CVE-2026-100807 CVE-2026-100808 CVE-2026-100809 CVE-2026-100811 CVE-2026-100812 CVE-2026-100814 CVE-2026-100815 CVE-2026-100816 CVE-2026-100818 CVE-2026-100819 CVE-2026-100820 CVE-2026-100821 CVE-2026-100822 CVE-2026-100824 CVE-2026-100825 CVE-2026-100826 CVE-2026-100828 CVE-2026-100829 CVE-2026-100830 CVE-2026-100831 CVE-2026-100832

Multiple security issues have been found in the Mozilla Firefox web browser, which could potentially result in the execution of arbitrary code, sandbox escape, information disclosure or privilege escalation.

Debian follows the extended support releases (ESR) of Firefox. Starting with this update we're now following the 153.x releases.

Between 140.x and 153.x, Firefox has seen a number of feature updates. For more information please refer to https://www.firefox.com/en-US/firefox/153.0esr/releasenotes/

For the stable distribution (trixie), these problems have been fixed in version 153.4.0esr-1~deb13u1.

We recommend that you upgrade your firefox-esr packages.

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

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

Mailing list: [email protected]

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 firefox-esr packages.

Plugin Details

Severity: Critical

ID: 352262

File Name: debian_DSA-6533.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Debian Local Security Checks

Published: 9/30/2026

Updated: 9/30/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5

Percentile: 93.19

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-2026-100832

CVSS v3

Risk Factor: Critical

Base Score: 9.6

Temporal Score: 8.3

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

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

CVSS Score Source: CVE-2026-100819

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:13.0, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ach, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-af, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-all, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-an, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ar, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ast, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-az, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-be, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-bg, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-bn, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-br, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-bs, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ca-valencia, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ca, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-cak, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-cs, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-cy, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-da, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-de, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-dsb, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-el, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-en-ca, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-en-gb, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-eo, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-es-ar, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-es-cl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-es-es, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-es-mx, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-et, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-eu, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-fa, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ff, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-fi, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-fr, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-fur, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-fy-nl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ga-ie, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-gd, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-gl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-gn, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-gu-in, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-he, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-hi-in, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-hr, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-hsb, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-hu, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-hy-am, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ia, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-id, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-is, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-it, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ja, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ka, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-kab, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-kk, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-km, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-kn, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ko, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-lij, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-lt, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-lv, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-mk, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-mr, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ms, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-my, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-nb-no, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ne-np, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-nl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-nn-no, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-oc, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-pa-in, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-pl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-pt-br, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-pt-pt, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-rm, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ro, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ru, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sat, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sc, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sco, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-si, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sk, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-skr, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-son, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sq, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sr, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-sv-se, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-szl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ta, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-te, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-tg, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-th, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-tl, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-tr, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-trs, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-uk, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-ur, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-uz, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-vi, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-xh, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-zh-cn, p-cpe:/a:debian:debian_linux:firefox-esr-l10n-zh-tw, p-cpe:/a:debian:debian_linux:firefox-esr

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

Exploit Ease: No known exploits are available

Patch Publication Date: 9/30/2026

Vulnerability Publication Date: 9/29/2026

Reference Information

CVE: CVE-2026-100756, CVE-2026-100757, CVE-2026-100758, CVE-2026-100759, CVE-2026-100760, CVE-2026-100762, CVE-2026-100765, CVE-2026-100766, CVE-2026-100767, CVE-2026-100769, CVE-2026-100770, CVE-2026-100771, CVE-2026-100772, CVE-2026-100773, CVE-2026-100774, CVE-2026-100775, CVE-2026-100776, CVE-2026-100777, CVE-2026-100778, CVE-2026-100779, CVE-2026-100780, CVE-2026-100781, CVE-2026-100782, CVE-2026-100783, CVE-2026-100784, CVE-2026-100785, CVE-2026-100786, CVE-2026-100787, CVE-2026-100788, CVE-2026-100789, CVE-2026-100790, CVE-2026-100791, CVE-2026-100792, CVE-2026-100794, CVE-2026-100797, CVE-2026-100798, CVE-2026-100800, CVE-2026-100801, CVE-2026-100803, CVE-2026-100806, CVE-2026-100807, CVE-2026-100808, CVE-2026-100809, CVE-2026-100811, CVE-2026-100812, CVE-2026-100814, CVE-2026-100815, CVE-2026-100816, CVE-2026-100818, CVE-2026-100819, CVE-2026-100820, CVE-2026-100821, CVE-2026-100822, CVE-2026-100824, CVE-2026-100825, CVE-2026-100826, CVE-2026-100828, CVE-2026-100829, CVE-2026-100830, CVE-2026-100831, CVE-2026-100832, CVE-2026-96869

Detections

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