Use After Free in Mozilla products - CVE-2026-4711

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Main Vulnerability Database Vulnerabilities #VU124317

Use After Free in Mozilla products - CVE-2026-4711

Published: March 24, 2026


Vulnerability identifier: #VU124317
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-2026-4711
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to use-after-free in the Widget: Cocoa component when handling UI events. A remote attacker can trick the victim into visiting a specially crafted website to execute arbitrary code.


Affected software

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

How to mitigate CVE-2026-4711

Install security update from vendor's website.

Firefox for Android - update to 149.0
Mozilla Firefox - update to 149.0
Firefox ESR - update to 140.9.0
Mozilla Thunderbird - addressed in versions 140.9.0, 149.0
firefox-debuginfo - update to 140.9.0-1
firefox-debugsource - update to 140.9.0-1
firefox - update to 140.9.0-1
firefox (Red Hat package) - addressed in versions 140.9.0-1.el7_9, 140.9.0-1.el8_2, 140.9.0-1.el8_4, 140.9.0-1.el8_6, 140.9.0-1.el8_10, 140.9.0-1.el9_0, 140.9.0-1.el9_2, 140.9.0-1.el9_4, 140.9.0-1.el9_7, 140.9.0-1.el10_0, 140.9.0-1.el10_1
thunderbird (Red Hat package) - addressed in versions 140.9.0-1.el8_2, 140.9.0-1.el8_4, 140.9.0-1.el8_6, 140.9.0-1.el8_8, 140.9.0-1.el9_2, 140.9.0-1.el9_4, 140.9.0-1.el9_6, 140.9.0-1.el10_0, 140.9.0-1.el10_1
firefox - update to 140.9.0-1.0.1
MozillaFirefox-devel - addressed in versions 140.9.0-112.304.2, 140.9.0-150200.152.225.1
MozillaFirefox - addressed in versions 140.9.0-112.304.2, 140.9.0-150200.152.225.1
MozillaFirefox-debuginfo - addressed in versions 140.9.0-112.304.2, 140.9.0-150200.152.225.1
MozillaFirefox-translations-common - addressed in versions 140.9.0-112.304.2, 140.9.0-150200.152.225.1
MozillaFirefox-debugsource - addressed in versions 140.9.0-112.304.2, 140.9.0-150200.152.225.1
MozillaThunderbird-translations-other - update to 140.9.0-150200.8.263.1
MozillaThunderbird - update to 140.9.0-150200.8.263.1
MozillaThunderbird-translations-common - update to 140.9.0-150200.8.263.1
MozillaThunderbird-debuginfo - update to 140.9.0-150200.8.263.1
MozillaThunderbird-debugsource - update to 140.9.0-150200.8.263.1
MozillaFirefox-translations-other - update to 140.9.0-150200.152.225.1
MozillaFirefox-branding-upstream - update to 140.9.0-150200.152.225.1
thunderbird - update to 140.9.1-1
thunderbird-debuginfo - update to 140.9.1-1
thunderbird-debugsource - update to 140.9.1-1
thunderbird-librnp-rnp - update to 140.9.1-1
thunderbird-wayland - update to 140.9.1-1
thunderbird - update to 140.12.0-1.0.1
firefox - update to 149.0-4.fc42

External References

Related Security Bulletins