Buffer overflow in Mozilla products - CVE-2026-74946

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Main Vulnerability Database Vulnerabilities #VU144052

Buffer overflow in Mozilla products - CVE-2026-74946

Published: August 18, 2026


Vulnerability identifier: #VU144052
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-74946
CWE-ID: CWE-119
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to escalate privileges.

The vulnerability exists due to incorrect boundary conditions in the Graphics: CanvasWebGL component when rendering web content. A remote attacker can cause the browser to process crafted content to escalate privileges.


Affected software

Mozilla Firefox
Firefox ESR
Firefox for Android
Debian Linux
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Anolis OS
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
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
Red Hat Enterprise Linux for Power, little endian - Extended Update Support
SUSE Package Hub 15
Desktop Applications Module
Basesystem Module
openSUSE Leap
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
rust-cbindgen-debuginfo
rust-cbindgen
rust-cbindgen-debugsource
mozilla-nss-tools
libsoftokn3-32bit
mozilla-nss-debuginfo-32bit
mozilla-nss-certs-32bit
mozilla-nss-certs-debuginfo-32bit
libsoftokn3-debuginfo-32bit
mozilla-nss-32bit
mozilla-nss-sysinit-debuginfo-32bit
libsoftokn3
libfreebl3-debuginfo-32bit
mozilla-nss
libfreebl3-32bit
mozilla-nss-sysinit-debuginfo
mozilla-nss-debuginfo
mozilla-nss-debugsource
libsoftokn3-debuginfo
mozilla-nss-certs
mozilla-nss-sysinit-32bit
libfreebl3-debuginfo
mozilla-nss-certs-debuginfo
mozilla-nss-devel
mozilla-nss-sysinit
libfreebl3
mozilla-nss-tools-debuginfo
libsoftokn3-32bit-debuginfo
mozilla-nss-certs-32bit-debuginfo
mozilla-nss-64bit
mozilla-nss-64bit-debuginfo
libfreebl3-64bit
libfreebl3-64bit-debuginfo
libsoftokn3-64bit-debuginfo
mozilla-nss-sysinit-64bit
mozilla-nss-certs-64bit
mozilla-nss-sysinit-64bit-debuginfo
mozilla-nss-certs-64bit-debuginfo
libsoftokn3-64bit
mozilla-nss-sysinit-32bit-debuginfo
mozilla-nss-32bit-debuginfo
libfreebl3-32bit-debuginfo
mozilla-nspr-devel
mozilla-nspr
mozilla-nspr-debuginfo-32bit
mozilla-nspr-debugsource
mozilla-nspr-debuginfo
mozilla-nspr-32bit
mozilla-nspr-64bit-debuginfo
mozilla-nspr-32bit-debuginfo
mozilla-nspr-64bit
thunderbird (Debian package)
firefox-esr (Debian package)
firefox
firefox-debuginfo
firefox-debugsource
thunderbird-wayland
thunderbird-librnp-rnp
thunderbird-debugsource
thunderbird-debuginfo
thunderbird
firefox (Red Hat package)
thunderbird (Red Hat package)
MozillaFirefox-debuginfo
MozillaFirefox-debugsource
MozillaFirefox-translations-common
MozillaFirefox
MozillaFirefox-devel
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaThunderbird-translations-common
MozillaThunderbird-debugsource
MozillaThunderbird-translations-other
MozillaFirefox-translations-other
MozillaFirefox-branding-upstream
MozillaFirefox-branding-SLE
Mozilla Thunderbird

How to mitigate CVE-2026-74946

Install security update from vendor's website.

Mozilla Firefox - update to 154.0
Firefox for Android - update to 154.0
Firefox ESR - addressed in versions 115.39.0, 140.14.0, 153.1.0
Mozilla Thunderbird - addressed in versions 140.14.0, 153.1.0, 154.0
rust-cbindgen-debuginfo - update to 0.29.4+git0-150400.11.3.2
rust-cbindgen - update to 0.29.4+git0-150400.11.3.2
rust-cbindgen-debugsource - update to 0.29.4+git0-150400.11.3.2
mozilla-nss-tools - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libsoftokn3-32bit - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-debuginfo-32bit - update to 3.125-58.147.1
mozilla-nss-certs-32bit - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-certs-debuginfo-32bit - update to 3.125-58.147.1
libsoftokn3-debuginfo-32bit - update to 3.125-58.147.1
mozilla-nss-32bit - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-sysinit-debuginfo-32bit - update to 3.125-58.147.1
libsoftokn3 - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libfreebl3-debuginfo-32bit - update to 3.125-58.147.1
mozilla-nss - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libfreebl3-32bit - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-sysinit-debuginfo - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-debuginfo - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-debugsource - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libsoftokn3-debuginfo - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-certs - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-sysinit-32bit - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libfreebl3-debuginfo - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-certs-debuginfo - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-devel - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-sysinit - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libfreebl3 - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
mozilla-nss-tools-debuginfo - addressed in versions 3.125-58.147.1, 3.125-150400.3.74.1
libsoftokn3-32bit-debuginfo - update to 3.125-150400.3.74.1
mozilla-nss-certs-32bit-debuginfo - update to 3.125-150400.3.74.1
mozilla-nss-64bit - update to 3.125-150400.3.74.1
mozilla-nss-64bit-debuginfo - update to 3.125-150400.3.74.1
libfreebl3-64bit - update to 3.125-150400.3.74.1
libfreebl3-64bit-debuginfo - update to 3.125-150400.3.74.1
libsoftokn3-64bit-debuginfo - update to 3.125-150400.3.74.1
mozilla-nss-sysinit-64bit - update to 3.125-150400.3.74.1
mozilla-nss-certs-64bit - update to 3.125-150400.3.74.1
mozilla-nss-sysinit-64bit-debuginfo - update to 3.125-150400.3.74.1
mozilla-nss-certs-64bit-debuginfo - update to 3.125-150400.3.74.1
libsoftokn3-64bit - update to 3.125-150400.3.74.1
mozilla-nss-sysinit-32bit-debuginfo - update to 3.125-150400.3.74.1
mozilla-nss-32bit-debuginfo - update to 3.125-150400.3.74.1
libfreebl3-32bit-debuginfo - update to 3.125-150400.3.74.1
mozilla-nspr-devel - addressed in versions 4.39-19.39.1, 4.39-150400.12.3.1
mozilla-nspr - addressed in versions 4.39-19.39.1, 4.39-150400.12.3.1
mozilla-nspr-debuginfo-32bit - update to 4.39-19.39.1
mozilla-nspr-debugsource - addressed in versions 4.39-19.39.1, 4.39-150400.12.3.1
mozilla-nspr-debuginfo - addressed in versions 4.39-19.39.1, 4.39-150400.12.3.1
mozilla-nspr-32bit - addressed in versions 4.39-19.39.1, 4.39-150400.12.3.1
mozilla-nspr-64bit-debuginfo - update to 4.39-150400.12.3.1
mozilla-nspr-32bit-debuginfo - update to 4.39-150400.12.3.1
mozilla-nspr-64bit - update to 4.39-150400.12.3.1
thunderbird (Debian package) - update to 1:140.14.0esr-1~deb13u1
firefox-esr (Debian package) - update to 140.14.0esr-1~deb13u1
firefox - update to 140.14.0-1
firefox-debuginfo - update to 140.14.0-1
firefox-debugsource - update to 140.14.0-1
thunderbird-wayland - update to 140.14.0-1
thunderbird-librnp-rnp - update to 140.14.0-1
thunderbird-debugsource - update to 140.14.0-1
thunderbird-debuginfo - update to 140.14.0-1
thunderbird - update to 140.14.0-1
firefox (Red Hat package) - addressed in versions 140.14.0-1.el7_9, 140.14.0-1.el8_4, 140.14.0-1.el8_6, 140.14.0-1.el8_8, 140.14.0-1.el8_10, 140.14.0-1.el9_4, 140.14.0-1.el9_6, 140.14.0-1.el9_8, 140.14.0-1.el10_2
thunderbird (Red Hat package) - addressed in versions 140.14.0-1.el8_4, 140.14.0-1.el8_6, 140.14.0-1.el8_8, 140.14.0-1.el8_10, 140.14.0-1.el9_2, 140.14.0-1.el9_6
thunderbird - update to 140.14.0-1.0.1
firefox - update to 140.14.0-1.0.1
MozillaFirefox-debuginfo - addressed in versions 140.14.0-112.327.1, 140.14.0-150200.152.251.1, 153.2.0-118.5.4, 153.2.0-150400.157.5.1
MozillaFirefox-debugsource - addressed in versions 140.14.0-112.327.1, 140.14.0-150200.152.251.1, 153.2.0-118.5.4, 153.2.0-150400.157.5.1
MozillaFirefox-translations-common - addressed in versions 140.14.0-112.327.1, 140.14.0-150200.152.251.1, 153.2.0-118.5.4, 153.2.0-150400.157.5.1
MozillaFirefox - addressed in versions 140.14.0-112.327.1, 140.14.0-150200.152.251.1, 153.2.0-118.5.4, 153.2.0-150400.157.5.1
MozillaFirefox-devel - addressed in versions 140.14.0-112.327.1, 140.14.0-150200.152.251.1, 153.2.0-118.5.4, 153.2.0-150400.157.5.1
MozillaThunderbird - update to 140.14.0-150200.8.283.1
MozillaThunderbird-debuginfo - update to 140.14.0-150200.8.283.1
MozillaThunderbird-translations-common - update to 140.14.0-150200.8.283.1
MozillaThunderbird-debugsource - update to 140.14.0-150200.8.283.1
MozillaThunderbird-translations-other - update to 140.14.0-150200.8.283.1
MozillaFirefox-translations-other - addressed in versions 140.14.0-150200.152.251.1, 153.2.0-150400.157.5.1
MozillaFirefox-branding-upstream - update to 153.2.0-150400.157.5.1
MozillaFirefox-branding-SLE - addressed in versions 153-41.3.8, 153-150400.14.3.1

External References

Related Security Bulletins