Security update for MozillaFirefox SUSE Patch security@suse.de SUSE Security Team openSUSE-SU-2026:20041-1 Final 1 1 2026-01-15T16:28:43Z current 2026-01-15T16:28:43Z 2026-01-15T16:28:43Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for MozillaFirefox This update for MozillaFirefox fixes the following issues: Update to Firefox Extended Support Release 140.7.0 ESR (bsc#1256340). - MFSA 2026-03 (bsc#1256340) * CVE-2026-0877: Mitigation bypass in the DOM: Security component * CVE-2026-0878: Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component * CVE-2026-0879: Sandbox escape due to incorrect boundary conditions in the Graphics component * CVE-2026-0880: Sandbox escape due to integer overflow in the Graphics component * CVE-2026-0882: Use-after-free in the IPC component * CVE-2025-14327: Spoofing issue in the Downloads Panel component * CVE-2026-0883: Information disclosure in the Networking component * CVE-2026-0884: Use-after-free in the JavaScript Engine component * CVE-2026-0885: Use-after-free in the JavaScript: GC component * CVE-2026-0886: Incorrect boundary conditions in the Graphics component * CVE-2026-0887: Clickjacking issue, information disclosure in the PDF Viewer component * CVE-2026-0890: Spoofing issue in the DOM: Copy & Paste and Drag & Drop component * CVE-2026-0891: Memory safety bugs fixed in Firefox ESR 140.7, Thunderbird ESR 140.7, Firefox 147 and Thunderbird 147 The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). openSUSE-Leap-16.0-146 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1256340 SUSE Bug 1256340 https://www.suse.com/security/cve/CVE-2025-14327/ SUSE CVE CVE-2025-14327 page https://www.suse.com/security/cve/CVE-2026-0877/ SUSE CVE CVE-2026-0877 page https://www.suse.com/security/cve/CVE-2026-0878/ SUSE CVE CVE-2026-0878 page https://www.suse.com/security/cve/CVE-2026-0879/ SUSE CVE CVE-2026-0879 page https://www.suse.com/security/cve/CVE-2026-0880/ SUSE CVE CVE-2026-0880 page https://www.suse.com/security/cve/CVE-2026-0882/ SUSE CVE CVE-2026-0882 page https://www.suse.com/security/cve/CVE-2026-0883/ SUSE CVE CVE-2026-0883 page https://www.suse.com/security/cve/CVE-2026-0884/ SUSE CVE CVE-2026-0884 page https://www.suse.com/security/cve/CVE-2026-0885/ SUSE CVE CVE-2026-0885 page https://www.suse.com/security/cve/CVE-2026-0886/ SUSE CVE CVE-2026-0886 page https://www.suse.com/security/cve/CVE-2026-0887/ SUSE CVE CVE-2026-0887 page https://www.suse.com/security/cve/CVE-2026-0890/ SUSE CVE CVE-2026-0890 page https://www.suse.com/security/cve/CVE-2026-0891/ SUSE CVE CVE-2026-0891 page openSUSE Leap 16.0 MozillaFirefox-140.7.0-160000.1.1 MozillaFirefox-branding-upstream-140.7.0-160000.1.1 MozillaFirefox-devel-140.7.0-160000.1.1 MozillaFirefox-translations-common-140.7.0-160000.1.1 MozillaFirefox-translations-other-140.7.0-160000.1.1 MozillaFirefox-140.7.0-160000.1.1 as a component of openSUSE Leap 16.0 MozillaFirefox-branding-upstream-140.7.0-160000.1.1 as a component of openSUSE Leap 16.0 MozillaFirefox-devel-140.7.0-160000.1.1 as a component of openSUSE Leap 16.0 MozillaFirefox-translations-common-140.7.0-160000.1.1 as a component of openSUSE Leap 16.0 MozillaFirefox-translations-other-140.7.0-160000.1.1 as a component of openSUSE Leap 16.0 Spoofing issue in the Downloads Panel component. This vulnerability affects Firefox < 146, Thunderbird < 146, Firefox ESR < 140.7, and Thunderbird < 140.7. CVE-2025-14327 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 important To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2025-14327.html CVE-2025-14327 https://bugzilla.suse.com/1254551 SUSE Bug 1254551 Mitigation bypass in the DOM: Security component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0877 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0877.html CVE-2026-0877 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0878 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0878.html CVE-2026-0878 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Sandbox escape due to incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0879 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0879.html CVE-2026-0879 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Sandbox escape due to integer overflow in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0880 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0880.html CVE-2026-0880 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Use-after-free in the IPC component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0882 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0882.html CVE-2026-0882 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Information disclosure in the Networking component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0883 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0883.html CVE-2026-0883 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Use-after-free in the JavaScript Engine component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0884 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0884.html CVE-2026-0884 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Use-after-free in the JavaScript: GC component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0885 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0885.html CVE-2026-0885 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Incorrect boundary conditions in the Graphics component. This vulnerability affects Firefox < 147, Firefox ESR < 115.32, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0886 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0886.html CVE-2026-0886 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Clickjacking issue, information disclosure in the PDF Viewer component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0887 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0887.html CVE-2026-0887 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Spoofing issue in the DOM: Copy & Paste and Drag & Drop component. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0890 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0890.html CVE-2026-0890 https://bugzilla.suse.com/1256340 SUSE Bug 1256340 Memory safety bugs present in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thunderbird 146. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 147, Firefox ESR < 140.7, Thunderbird < 147, and Thunderbird < 140.7. CVE-2026-0891 openSUSE Leap 16.0:MozillaFirefox-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-branding-upstream-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-devel-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-common-140.7.0-160000.1.1 openSUSE Leap 16.0:MozillaFirefox-translations-other-140.7.0-160000.1.1 critical To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-0891.html CVE-2026-0891 https://bugzilla.suse.com/1256340 SUSE Bug 1256340