Out-of-bounds read in Firefox ESR and Mozilla Firefox - CVE-2025-10532

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Main Vulnerability Database Vulnerabilities #VU115731

Out-of-bounds read in Firefox ESR and Mozilla Firefox - CVE-2025-10532

Published: September 17, 2025


Vulnerability identifier: #VU115731
CSH Severity: Medium
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-10532
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to a boundary condition in the JavaScript: GC component. A remote attacker can create a specially crafted website, trick the victim into opening it, trigger an out-of-bounds read error and read contents of memory on the system.


Affected software

Firefox ESR
Mozilla Firefox
SUSE Linux Enterprise Server 15 SP4
Debian Linux
SUSE Linux Enterprise Server 15 SP3
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Workstation Extension 15
Anolis OS
SUSE Enterprise Storage
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
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
Ubuntu
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
firefox-debugsource
firefox-debuginfo
firefox
firefox-esr (Debian package)
thunderbird (Debian package)
firefox (Red Hat package)
thunderbird (Red Hat package)
MozillaThunderbird-translations-common
MozillaThunderbird-translations-other
MozillaThunderbird-debugsource
MozillaThunderbird
MozillaThunderbird-debuginfo
MozillaFirefox-translations-other
MozillaFirefox-translations-common
MozillaFirefox-debuginfo
MozillaFirefox-devel
MozillaFirefox
MozillaFirefox-debugsource
MozillaFirefox-branding-upstream
thunderbird
thunderbird-debuginfo
thunderbird-debugsource
thunderbird-librnp-rnp
thunderbird-wayland
thunderbird (Ubuntu package)
Mozilla Thunderbird

How to mitigate CVE-2025-10532

Install updates from vendor's website.

Firefox ESR - update to 140.3.0
Mozilla Firefox - update to 143.0
Mozilla Thunderbird - addressed in versions 140.3, 143.0
firefox-debugsource - addressed in versions 128.14.0-1, 140.3.1-1
firefox-debuginfo - addressed in versions 128.14.0-1, 140.3.1-1
firefox - addressed in versions 128.14.0-1, 140.3.1-1
firefox-esr (Debian package) - addressed in versions 140.3.0esr-1~deb12u1, 140.3.0esr-1~deb13u1
thunderbird (Debian package) - addressed in versions 1:140.3.0esr-1~deb12u1, 1:140.3.0esr-1~deb13u1
firefox - addressed in versions 140.3.0-1, 140.3.0-1.0.2, 140.4.0-3.0.1
firefox (Red Hat package) - addressed in versions 140.3.0-1.el7_9, 140.3.0-1.el8_2, 140.3.0-1.el8_4, 140.3.0-1.el8_6, 140.3.0-1.el8_8, 140.3.0-1.el8_10, 140.3.0-1.el9_0, 140.3.0-1.el9_2, 140.3.0-1.el9_4, 140.3.0-1.el9_6, 140.3.0-1.el10_0
thunderbird (Red Hat package) - addressed in versions 140.3.0-1.el8_2, 140.3.0-1.el8_4, 140.3.0-1.el8_6, 140.3.0-1.el8_8, 140.3.0-1.el8_10, 140.3.0-1.el9_0, 140.3.0-1.el9_2, 140.3.0-1.el9_4, 140.3.0-1.el9_6, 140.3.0-1.el10_0
MozillaThunderbird-translations-common - update to 140.3.0-150200.8.239.1
MozillaThunderbird-translations-other - update to 140.3.0-150200.8.239.1
MozillaThunderbird-debugsource - update to 140.3.0-150200.8.239.1
MozillaThunderbird - update to 140.3.0-150200.8.239.1
MozillaThunderbird-debuginfo - update to 140.3.0-150200.8.239.1
MozillaFirefox-translations-other - update to 140.3.0-150200.152.201.1
MozillaFirefox-translations-common - update to 140.3.0-150200.152.201.1
MozillaFirefox-debuginfo - update to 140.3.0-150200.152.201.1
MozillaFirefox-devel - update to 140.3.0-150200.152.201.1
MozillaFirefox - update to 140.3.0-150200.152.201.1
MozillaFirefox-debugsource - update to 140.3.0-150200.152.201.1
MozillaFirefox-branding-upstream - update to 140.3.0-150200.152.201.1
thunderbird - update to 140.4.0-1
thunderbird-debuginfo - update to 140.4.0-1
thunderbird-debugsource - update to 140.4.0-1
thunderbird-librnp-rnp - update to 140.4.0-1
thunderbird-wayland - update to 140.4.0-1
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