Description
An attacker was able to perform an out-of-bounds read or write on a JavaScript object by confusing array index sizes. This vulnerability was fixed in Firefox 138.0.4, Firefox ESR 128.10.1, Firefox ESR 115.23.1, Thunderbird 128.10.2, and Thunderbird 138.0.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.23.1 |
| Mozilla | Thunderbird | — | 128.10.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | firefox-esr | 128.10.1esr-1 | — |
| Debian 14 | thunderbird | 1:128.11.0esr-1 | — |
| Debian 13 | firefox-esr | 128.10.1esr-1 | — |
| Debian 13 | thunderbird | 1:128.11.0esr-1 | — |
| Debian 12 | firefox-esr | 128.10.1esr-1~deb12u1 | DSA-5922-1 |
| Debian 12 | thunderbird | 1:128.11.0esr-1~deb12u1 | DSA-5932-1 |
| Debian 11 | firefox-esr | 128.10.1esr-1~deb11u1 | DLA-4172-1 |
| Debian 11 | thunderbird | 1:128.11.0esr-1~deb11u1 | DLA-4194-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | firefox | 128.10.1-1.el10_0 | RHSA-2025:8125 |
| RHEL 10 | thunderbird | 128.11.0-1.el10_0 | RHSA-2025:8608 |
| RHEL 9 | firefox +1 | 128.10.1-1.el9_6 | RHSA-2025:8049 |
| RHEL 9 | thunderbird | 128.11.0-1.el9_6 | RHSA-2025:8607 |
| RHEL 8 | firefox | 128.10.1-1.el8_10 | RHSA-2025:8060 |
| RHEL 8 | thunderbird | 128.11.0-1.el8_10 | RHSA-2025:8756 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +1 | 128.10.1-1.el9_4 | RHSA-2025:8370 |
| RHEL 9.4 EUS | thunderbird | 128.11.0-1.el9_4 | RHSA-2025:8599 |
| RHEL 9.2 EUS | firefox +1 | 128.10.1-1.el9_2 | RHSA-2025:8369 |
| RHEL 9.2 E4S | thunderbird | 128.11.0-1.el9_2 | RHSA-2025:8642 |
| RHEL 9.0 E4S | firefox | 128.10.1-1.el9_0 | RHSA-2025:8371 |
| RHEL 9.0 E4S | thunderbird | 128.11.0-1.el9_0 | RHSA-2025:8598 |
| RHEL 8.8 TUS | firefox | 128.10.1-1.el8_8 | RHSA-2025:8807 |
| RHEL 8.8 TUS | thunderbird | 128.11.0-1.el8_8 | RHSA-2025:8628 |
| RHEL 8.8 E4S | firefox | 128.10.1-1.el8_8 | RHSA-2025:8807 |
| RHEL 8.8 E4S | thunderbird | 128.11.0-1.el8_8 | RHSA-2025:8628 |
| RHEL 8.6 TUS | firefox | 128.10.1-1.el8_6 | RHSA-2025:8645 |
| RHEL 8.6 TUS | thunderbird | 128.11.0-1.el8_6 | RHSA-2025:8629 |
| RHEL 8.6 E4S | firefox | 128.10.1-1.el8_6 | RHSA-2025:8645 |
| RHEL 8.6 E4S | thunderbird | 128.11.0-1.el8_6 | RHSA-2025:8629 |
| RHEL 8.6 AUS | firefox | 128.10.1-1.el8_6 | RHSA-2025:8645 |
| RHEL 8.6 AUS | thunderbird | 128.11.0-1.el8_6 | RHSA-2025:8629 |
| RHEL 8.4 AUS | firefox | 128.10.1-1.el8_4 | RHSA-2025:8640 |
| RHEL 8.4 AUS | thunderbird | 128.11.0-1.el8_4 | RHSA-2025:8630 |
| RHEL 8.2 AUS | firefox | 128.10.1-1.el8_2 | RHSA-2025:8639 |
| RHEL 8.2 AUS | thunderbird | 128.11.0-1.el8_2 | RHSA-2025:8631 |
| RHEL 7 ELS | firefox | 128.10.1-1.el7_9 | RHSA-2025:8465 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.10.1-1.el10_0 | ALSA-2025:8125 |
| AlmaLinux 10 | thunderbird | 128.11.0-1.el10_0.alma.1 | ALSA-2025:8608 |
| AlmaLinux 9 | firefox +1 | 128.10.1-1.el9_6.alma.1 | ALSA-2025:8049 |
| AlmaLinux 9 | thunderbird | 128.11.0-1.el9_6.alma.1 | ALSA-2025:8607 |
| AlmaLinux 8 | firefox | 128.10.1-1.el8_10.alma.1 | ALSA-2025:8060 |
| AlmaLinux 8 | thunderbird | 128.11.0-1.el8_10.alma.1 | ALSA-2025:8756 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox | 128.10.1-1.el10_0 | RLSA-2025:8125 |
| Rocky Linux 10 | thunderbird | 128.11.0-1.el10_0 | RLSA-2025:8608 |
| Rocky Linux 9 | thunderbird | 128.11.0-1.el9_6 | RLSA-2025:8607 |
| Rocky Linux 8 | firefox | 128.10.1-1.el8_10 | RLSA-2025:8060 |
| Rocky Linux 8 | thunderbird | 128.11.0-1.el8_10 | RLSA-2025:8756 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaThunderbird | 128.10.2-150200.8.218.1 | SUSE-SU-2025:01813-1 |
| SLES 15 SP6 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.10.2-150200.8.218.1 | SUSE-SU-2025:01813-1 |
| SLES 15 SP5 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLES 15 SP4 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLES 15 SP3 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.10.1-112.259.1 | SUSE-SU-2025:01710-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 138.0.4-1.1 | openSUSE-SU-2025:15148-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 128.10.2-1.1 | openSUSE-SU-2025:15149-1 |
| openSUSE Tumbleweed | firefox-esr | 128.10.1-1.1 | openSUSE-SU-2025:15133-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.10.1-150200.152.182.1 | SUSE-SU-2025:01701-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.10.2-150200.8.218.1 | SUSE-SU-2025:01813-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 128.11.0-1.amzn2023.0.2 | ALAS2023-2025-996 |
| Amazon Linux 2 | thunderbird | 128.11.0-1.amzn2.0.1 | ALAS2-2025-2873 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 128.11.0-1.0.1.el10_0 | ELSA-2025-8608, ELSA-2025-8125 |
| Oracle Linux 9 | firefox +1 | 128.10.1-1.0.1.el9_6 | ELSA-2025-8049 |
| Oracle Linux 9 | thunderbird | 128.11.0-1.0.1.el9_6 | ELSA-2025-8607 |
| Oracle Linux 8 | firefox | 128.10.1-1.el8_10 | ELSA-2025-8060 |
| Oracle Linux 8 | thunderbird | 128.11.0-1.0.1.el8_10 | ELSA-2025-8756 |
| Oracle Linux 7 | firefox | 128.10.1-1.0.1.el7_9 | ELSA-2025-8465 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.10.1-r0 | — |
Advisories 50
- ALSA-2025:8608 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8125 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8607 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8049 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8060 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8756 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:8756 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Aug 7, 2026
- RHSA-2025:8370 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:8807 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8645 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8640 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8642 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8639 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8631 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8629 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8630 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8628 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8608 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8607 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8599 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8598 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8465 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8371 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8369 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8125 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8060 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8049 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15148-1 MozillaFirefox-138.0.4-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15149-1 MozillaThunderbird-128.10.2-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01813-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01701-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5922-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5932-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4172-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4194-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- WID-SEC-2025-1097 Mozilla Firefox / Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 18, 2026
- openSUSE-SU-2025:15133-1 firefox-esr-128.10.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 5, 2026
- SUSE-SU-2025:01710-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- RLSA-2025:8608 Important: thunderbird security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:8125 Important: firefox security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:8607 Important: thunderbird security update Rocky Linux Security Advisories · Oct 4, 2025
- RLSA-2025:8756 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:8060 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-8125 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-8608 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 27, 2025
- ALAS2-2025-2873 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jun 12, 2025
- ALAS2023-2025-996 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 10, 2025
- ELSA-2025-8756 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 10, 2025
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1966614
- https://www.mozilla.org/security/advisories/mfsa2025-36/
- https://www.mozilla.org/security/advisories/mfsa2025-37/
- https://www.mozilla.org/security/advisories/mfsa2025-38/
- https://www.mozilla.org/security/advisories/mfsa2025-40/
- https://www.mozilla.org/security/advisories/mfsa2025-41/