Heap-based buffer overflow in Mozilla products - CVE-2026-2447

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Main Vulnerability Database Vulnerabilities #VU122970

Heap-based buffer overflow in Mozilla products - CVE-2026-2447

Published: February 16, 2026


Vulnerability identifier: #VU122970
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-2026-2447
CWE-ID: CWE-122
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 in libvpx. A remote attacker can trick the victim into visiting a specially crafted webpage, trigger a heap-based buffer overflow and execute arbitrary code on the target system.

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


Affected software

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

How to mitigate CVE-2026-2447

Install updates from vendor's website.

Mozilla Firefox - update to 147.0.4
Firefox for Android - update to 147.0.4
Firefox ESR - addressed in versions 115.32.1, 140.7.1
Mozilla Thunderbird - addressed in versions 140.7.2, 147.0.2
libvpx-devel - addressed in versions 1.3.0-8, 1.7.0-13.0.1, 1.14.1-3
libvpx-utils - addressed in versions 1.3.0-8, 1.14.1-3
libvpx - addressed in versions 1.3.0-8, 1.7.0-13.0.1, 1.14.1-3
libvpx (Red Hat package) - addressed in versions 1.3.0-8.el7_9.3, 1.7.0-8.el8_2.2, 1.7.0-10.el8_4.2, 1.7.0-10.el8_8.2, 1.7.0-13.el8_10, 1.9.0-7.el9_0.3, 1.9.0-7.el9_2.3, 1.9.0-7.el9_4.3, 1.9.0-10.el9_7, 1.14.1-3.el10_0.1
libvpx-doc - addressed in versions 1.7.0-13.0.1, 1.14.1-3
libvpx (Ubuntu package) - addressed in versions 1.11.0-2ubuntu2.5, 1.14.0-1ubuntu2.3, 1.15.0-2.1ubuntu0.1
libvpx (Debian package) - addressed in versions 1.12.0-1+deb12u5, 1.15.0-2.1+deb13u1
libvpx-devel - update to 1.13.1-5
libvpx-debugsource - update to 1.13.1-5
libvpx - update to 1.13.1-5
libvpx-debuginfo - update to 1.13.1-5
MozillaFirefox-debugsource - addressed in versions 140.7.1-112.298.1, 140.7.1-150200.152.219.1
MozillaFirefox-debuginfo - addressed in versions 140.7.1-112.298.1, 140.7.1-150200.152.219.1
MozillaFirefox-translations-common - addressed in versions 140.7.1-112.298.1, 140.7.1-150200.152.219.1
MozillaFirefox - addressed in versions 140.7.1-112.298.1, 140.7.1-150200.152.219.1
MozillaFirefox-devel - addressed in versions 140.7.1-112.298.1, 140.7.1-150200.152.219.1
MozillaFirefox-translations-other - update to 140.7.1-150200.152.219.1
MozillaFirefox-branding-upstream - update to 140.7.1-150200.152.219.1
thunderbird - addressed in versions 140.7.2-1, 140.8.0-1
thunderbird-wayland - addressed in versions 140.7.2-1, 140.8.0-1
thunderbird-librnp-rnp - addressed in versions 140.7.2-1, 140.8.0-1
thunderbird-debugsource - addressed in versions 140.7.2-1, 140.8.0-1
thunderbird-debuginfo - addressed in versions 140.7.2-1, 140.8.0-1
MozillaThunderbird-translations-common - update to 140.7.2-150200.8.257.1
MozillaThunderbird-debugsource - update to 140.7.2-150200.8.257.1
MozillaThunderbird-translations-other - update to 140.7.2-150200.8.257.1
MozillaThunderbird-debuginfo - update to 140.7.2-150200.8.257.1
MozillaThunderbird - update to 140.7.2-150200.8.257.1
firefox-debugsource - update to 140.8.0-1
firefox-debuginfo - update to 140.8.0-1
firefox - update to 140.8.0-1
thunderbird (Red Hat package) - addressed in versions 140.8.0-1.el8_2, 140.8.0-1.el8_6, 140.8.0-1.el8_8, 140.8.0-1.el9_0, 140.8.0-1.el9_2, 140.8.0-1.el9_6, 140.8.0-1.el9_7, 140.8.0-2.el10_0, 140.8.0-2.el10_1
firefox (Red Hat package) - addressed in versions 140.8.0-2.el7_9, 140.8.0-2.el8_2, 140.8.0-2.el8_4, 140.8.0-2.el8_6, 140.8.0-2.el8_8, 140.8.0-2.el9_0, 140.8.0-2.el9_2, 140.8.0-2.el9_4, 140.8.0-2.el9_6, 140.8.0-2.el9_7, 140.8.0-2.el10_1
firefox - update to 140.8.0-2.0.1
thunderbird - update to 140.12.0-1.0.1

External References

Related Security Bulletins