SUSE-SU-2026:21383-1: important: Security update for MozillaFirefox

SLE-UPDATES null at suse.de
Tue Apr 28 16:30:40 UTC 2026 


# Security update for MozillaFirefox

Announcement ID: SUSE-SU-2026:21383-1  
Release Date: 2026-04-23T14:47:03Z  
Rating: important  
References:

  * bsc#1262230

  
Cross-References:

  * CVE-2026-6746
  * CVE-2026-6747
  * CVE-2026-6748
  * CVE-2026-6749
  * CVE-2026-6750
  * CVE-2026-6751
  * CVE-2026-6752
  * CVE-2026-6753
  * CVE-2026-6754
  * CVE-2026-6757
  * CVE-2026-6759
  * CVE-2026-6761
  * CVE-2026-6762
  * CVE-2026-6763
  * CVE-2026-6764
  * CVE-2026-6765
  * CVE-2026-6766
  * CVE-2026-6767
  * CVE-2026-6769
  * CVE-2026-6770
  * CVE-2026-6771
  * CVE-2026-6772
  * CVE-2026-6776
  * CVE-2026-6785
  * CVE-2026-6786

  
CVSS scores:

  * CVE-2026-6746 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-6747 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-6748 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-6749 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-6750 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-6751 ( NVD ):  7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2026-6752 ( NVD ):  7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2026-6753 ( NVD ):  7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
  * CVE-2026-6754 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-6757 ( NVD ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-6759 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-6761 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-6762 ( NVD ):  6.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
  * CVE-2026-6763 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
  * CVE-2026-6764 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
  * CVE-2026-6765 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-6766 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-6767 ( NVD ):  5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
  * CVE-2026-6769 ( NVD ):  8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-6770 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
  * CVE-2026-6771 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-6772 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
  * CVE-2026-6776 ( NVD ):  7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
  * CVE-2026-6785 ( NVD ):  8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-6786 ( NVD ):  8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

  
Affected Products:

  * SUSE Linux Enterprise Server 16.0
  * SUSE Linux Enterprise Server for SAP applications 16.0

  
  
An update that solves 25 vulnerabilities can now be installed.

## Description:

This update for MozillaFirefox fixes the following issues:

Update to Firefox Extended Support Release 140.10.0 ESR.

  * MFSA 2026-32 (bsc#1262230):
  * CVE-2026-6746: Use-after-free in the DOM: Core & HTML component
  * CVE-2026-6747: Use-after-free in the WebRTC component
  * CVE-2026-6748: Uninitialized memory in the Audio/Video: Web Codecs component
  * CVE-2026-6749: Information disclosure due to uninitialized memory in the
    Graphics: Canvas2D component
  * CVE-2026-6750: Privilege escalation in the Graphics: WebRender component
  * CVE-2026-6751: Uninitialized memory in the Audio/Video: Web Codecs component
  * CVE-2026-6752: Incorrect boundary conditions in the WebRTC component
  * CVE-2026-6753: Incorrect boundary conditions in the WebRTC component
  * CVE-2026-6754: Use-after-free in the JavaScript Engine component
  * CVE-2026-6757: Invalid pointer in the JavaScript: WebAssembly component
  * CVE-2026-6759: Use-after-free in the Widget: Cocoa component
  * CVE-2026-6761: Privilege escalation in the Networking component
  * CVE-2026-6762: Spoofing issue in the DOM: Core & HTML component
  * CVE-2026-6763: Mitigation bypass in the File Handling component
  * CVE-2026-6764: Incorrect boundary conditions in the DOM: Device Interfaces
    component
  * CVE-2026-6765: Information disclosure in the Form Autofill component
  * CVE-2026-6766: Incorrect boundary conditions in the Libraries component in
    NSS
  * CVE-2026-6767: Other issue in the Libraries component in NSS
  * CVE-2026-6769: Privilege escalation in the Debugger component
  * CVE-2026-6770: Other issue in the Storage: IndexedDB component
  * CVE-2026-6771: Mitigation bypass in the DOM: Security component
  * CVE-2026-6772: Incorrect boundary conditions in the Libraries component in
    NSS
  * CVE-2026-6776: Incorrect boundary conditions in the WebRTC: Networking
    component
  * CVE-2026-6785: Memory safety bugs fixed in Firefox ESR 115.35, Firefox ESR
    140.10, Thunderbird ESR 140.10, Firefox 150 and Thunderbird 150
  * CVE-2026-6786: Memory safety bugs fixed in Firefox ESR 140.10, Thunderbird
    ESR 140.10, Firefox 150 and Thunderbird 150

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Enterprise Server for SAP applications 16.0  
    zypper in -t patch SUSE-SLES-16.0-635=1

  * SUSE Linux Enterprise Server 16.0  
    zypper in -t patch SUSE-SLES-16.0-635=1

## Package List:

  * SUSE Linux Enterprise Server for SAP applications 16.0 (ppc64le x86_64)
    * MozillaFirefox-debuginfo-140.10.0-160000.1.1
    * MozillaFirefox-translations-common-140.10.0-160000.1.1
    * MozillaFirefox-140.10.0-160000.1.1
    * MozillaFirefox-translations-other-140.10.0-160000.1.1
    * MozillaFirefox-debugsource-140.10.0-160000.1.1
  * SUSE Linux Enterprise Server for SAP applications 16.0 (noarch)
    * MozillaFirefox-devel-140.10.0-160000.1.1
  * SUSE Linux Enterprise Server 16.0 (aarch64 ppc64le s390x x86_64)
    * MozillaFirefox-debuginfo-140.10.0-160000.1.1
    * MozillaFirefox-translations-common-140.10.0-160000.1.1
    * MozillaFirefox-140.10.0-160000.1.1
    * MozillaFirefox-translations-other-140.10.0-160000.1.1
    * MozillaFirefox-debugsource-140.10.0-160000.1.1
  * SUSE Linux Enterprise Server 16.0 (noarch)
    * MozillaFirefox-devel-140.10.0-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-6746.html
  * https://www.suse.com/security/cve/CVE-2026-6747.html
  * https://www.suse.com/security/cve/CVE-2026-6748.html
  * https://www.suse.com/security/cve/CVE-2026-6749.html
  * https://www.suse.com/security/cve/CVE-2026-6750.html
  * https://www.suse.com/security/cve/CVE-2026-6751.html
  * https://www.suse.com/security/cve/CVE-2026-6752.html
  * https://www.suse.com/security/cve/CVE-2026-6753.html
  * https://www.suse.com/security/cve/CVE-2026-6754.html
  * https://www.suse.com/security/cve/CVE-2026-6757.html
  * https://www.suse.com/security/cve/CVE-2026-6759.html
  * https://www.suse.com/security/cve/CVE-2026-6761.html
  * https://www.suse.com/security/cve/CVE-2026-6762.html
  * https://www.suse.com/security/cve/CVE-2026-6763.html
  * https://www.suse.com/security/cve/CVE-2026-6764.html
  * https://www.suse.com/security/cve/CVE-2026-6765.html
  * https://www.suse.com/security/cve/CVE-2026-6766.html
  * https://www.suse.com/security/cve/CVE-2026-6767.html
  * https://www.suse.com/security/cve/CVE-2026-6769.html
  * https://www.suse.com/security/cve/CVE-2026-6770.html
  * https://www.suse.com/security/cve/CVE-2026-6771.html
  * https://www.suse.com/security/cve/CVE-2026-6772.html
  * https://www.suse.com/security/cve/CVE-2026-6776.html
  * https://www.suse.com/security/cve/CVE-2026-6785.html
  * https://www.suse.com/security/cve/CVE-2026-6786.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1262230

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