Buffer overflow in Mozilla products - CVE-2026-0878

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Main Vulnerability Database Vulnerabilities #VU121212

Buffer overflow in Mozilla products - CVE-2026-0878

Published: January 13, 2026


Vulnerability identifier: #VU121212
CSH Severity: High
CVSS v4: 8.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-0878
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary error within the in the Graphics: CanvasWebGL component. A remote attacker can trick the victim into visiting a specially crafted website, trigger memory corruption and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.


Affected software

Firefox for Android
Firefox ESR
Mozilla Firefox
Debian Linux
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
Anolis OS
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
Red Hat Enterprise Linux for ARM 64 - Extended Update Support
Red Hat Enterprise Linux for IBM z Systems - Extended Update Support
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
Red Hat Enterprise Linux for x86_64 - Extended Update Support
SUSE Package Hub 15
Desktop Applications Module
openSUSE Leap
openEuler
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
thunderbird (Debian package)
firefox-esr (Debian package)
firefox-debuginfo
thunderbird-debuginfo
thunderbird-debugsource
thunderbird-librnp-rnp
thunderbird-wayland
firefox-debugsource
firefox
thunderbird
firefox (Red Hat package)
thunderbird (Red Hat package)
MozillaFirefox-debuginfo
MozillaFirefox
MozillaFirefox-translations-common
MozillaFirefox-debugsource
MozillaFirefox-devel
MozillaThunderbird-translations-common
MozillaThunderbird-debuginfo
MozillaThunderbird-translations-other
MozillaThunderbird-debugsource
MozillaThunderbird
MozillaFirefox-translations-other
MozillaFirefox-branding-upstream
thunderbird (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2026-0878

Install updates from vendor's website.

Firefox for Android - update to 147.0
Firefox ESR - update to 140.7.0
Mozilla Firefox - update to 147.0
Mozilla Thunderbird - addressed in versions 140.7.0, 147.0
thunderbird (Debian package) - addressed in versions 1:140.7.0esr-1~deb12u1, 1:140.7.0esr-1~deb13u1
firefox-esr (Debian package) - addressed in versions 140.7.0esr-1~deb12u1, 140.7.0esr-1~deb13u1
firefox-debuginfo - update to 140.7.0-1
thunderbird-debuginfo - update to 140.7.0-1
thunderbird-debugsource - update to 140.7.0-1
thunderbird-librnp-rnp - update to 140.7.0-1
thunderbird-wayland - update to 140.7.0-1
firefox-debugsource - update to 140.7.0-1
firefox - update to 140.7.0-1
thunderbird - update to 140.7.0-1
firefox - addressed in versions 140.7.0-1, 140.7.0-1.0.1, 140.7.0-1.0.2
firefox (Red Hat package) - addressed in versions 140.7.0-1.el7_9, 140.7.0-1.el8_2, 140.7.0-1.el8_4, 140.7.0-1.el8_6, 140.7.0-1.el8_8, 140.7.0-1.el8_10, 140.7.0-1.el9_0, 140.7.0-1.el9_2, 140.7.0-1.el9_4, 140.7.0-1.el9_6, 140.7.0-1.el9_7, 140.7.0-1.el10_0, 140.7.0-1.el10_1
thunderbird (Red Hat package) - addressed in versions 140.7.0-1.el8_2, 140.7.0-1.el8_4, 140.7.0-1.el8_6, 140.7.0-1.el8_8, 140.7.0-1.el9_0, 140.7.0-1.el9_2, 140.7.0-1.el9_4, 140.7.0-1.el9_7, 140.7.0-1.el10_0, 140.7.0-1.el10_1, 140.7.0-2.el9_6
MozillaFirefox-debuginfo - addressed in versions 140.7.0-112.295.1, 140.7.0-150200.152.216.1
MozillaFirefox - addressed in versions 140.7.0-112.295.1, 140.7.0-150200.152.216.1
MozillaFirefox-translations-common - addressed in versions 140.7.0-112.295.1, 140.7.0-150200.152.216.1
MozillaFirefox-debugsource - addressed in versions 140.7.0-112.295.1, 140.7.0-150200.152.216.1
MozillaFirefox-devel - addressed in versions 140.7.0-112.295.1, 140.7.0-150200.152.216.1
MozillaThunderbird-translations-common - update to 140.7.0-150200.8.251.1
MozillaThunderbird-debuginfo - update to 140.7.0-150200.8.251.1
MozillaThunderbird-translations-other - update to 140.7.0-150200.8.251.1
MozillaThunderbird-debugsource - update to 140.7.0-150200.8.251.1
MozillaThunderbird - update to 140.7.0-150200.8.251.1
MozillaFirefox-translations-other - update to 140.7.0-150200.152.216.1
MozillaFirefox-branding-upstream - update to 140.7.0-150200.152.216.1
thunderbird (Ubuntu package) - update to 1:140.7.1+build1-0ubuntu0.22.04.1
thunderbird - update to 140.12.0-1.0.1

External References

Related Security Bulletins