Access of Uninitialized Pointer in Mozilla products - CVE-2026-15718

Vulnerability identifier: #VU137817

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-2026-15718

CWE-ID: CWE-824

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to execute arbitrary code.

The vulnerability exists due to an invalid pointer in the JavaScript: WebAssembly component when processing web content. A remote attacker can trigger the vulnerable component to execute arbitrary code.

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

Install security update from vendor's website.

Mozilla Firefox - update to 152.0.6
Firefox for Android - update to 152.0.6
Firefox ESR - addressed in versions 115.38.0, 140.13.0
Mozilla Thunderbird - update to 140.13.0
firefox-esr (Debian package) - update to 140.13.0esr-1~deb13u1
thunderbird (Debian package) - update to 1:140.13.0esr-2~deb13u1
thunderbird-wayland - update to 140.13.0-1
thunderbird-librnp-rnp - update to 140.13.0-1
thunderbird-debugsource - update to 140.13.0-1
thunderbird-debuginfo - update to 140.13.0-1
thunderbird - update to 140.13.0-1
thunderbird (Red Hat package) - addressed in versions 140.13.0-1.el8_10, 140.13.0-1.el9_2, 140.13.0-1.el9_6, 140.13.0-1.el9_8, 140.13.0-1.el10_0, 140.13.0-1.el10_2
thunderbird - update to 140.13.0-1.0.1
firefox-debuginfo - update to 140.13.0-2
firefox-debugsource - update to 140.13.0-2
firefox - update to 140.13.0-2
MozillaFirefox-translations-common - addressed in versions 140.13.0-112.324.2, 140.13.0-150200.152.248.1
MozillaFirefox - addressed in versions 140.13.0-112.324.2, 140.13.0-150200.152.248.1
MozillaFirefox-debuginfo - addressed in versions 140.13.0-112.324.2, 140.13.0-150200.152.248.1
MozillaFirefox-debugsource - addressed in versions 140.13.0-112.324.2, 140.13.0-150200.152.248.1
MozillaFirefox-devel - addressed in versions 140.13.0-112.324.2, 140.13.0-150200.152.248.1
MozillaThunderbird-translations-common - update to 140.13.0-150200.8.280.1
MozillaThunderbird-debuginfo - update to 140.13.0-150200.8.280.1
MozillaThunderbird - update to 140.13.0-150200.8.280.1
MozillaThunderbird-debugsource - update to 140.13.0-150200.8.280.1
MozillaThunderbird-translations-other - update to 140.13.0-150200.8.280.1
MozillaFirefox-translations-other - update to 140.13.0-150200.152.248.1

• https://www.mozilla.org/en-US/security/advisories/mfsa2026-67/
• https://bugzilla.mozilla.org/show_bug.cgi?id=2045443
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-70/ 
• https://www.mozilla.org/en-US/security/advisories/mfsa2026-68/

• Two vulnerabilities in Mozilla Firefox
• Multiple vulnerabilities in Mozilla Thunderbird ESR
• Debian update for firefox-esr
• SUSE update for MozillaFirefox
• SUSE update for MozillaFirefox
• openEuler 22.03 LTS SP4 update for firefox
• openEuler 24.03 LTS SP4 update for firefox
• openEuler 24.03 LTS SP3 update for firefox
• openEuler 24.03 LTS SP1 update for firefox
• openEuler 24.03 LTS SP3 update for thunderbird
• openEuler 24.03 LTS SP4 update for thunderbird
• Red Hat Enterprise Linux 10 update for thunderbird
• Red Hat Enterprise Linux 9 update for thunderbird
• Red Hat Enterprise Linux 8 update for thunderbird
• Debian update for thunderbird
• Anolis OS update for thunderbird
• SUSE update for MozillaThunderbird
• Red Hat Enterprise Linux 10 update for thunderbird
• Red Hat Enterprise Linux 9 update for thunderbird
• Red Hat Enterprise Linux 9 update for thunderbird