Description
Memory safety bugs present in Firefox 137, Thunderbird 137, Firefox ESR 128.9, and Thunderbird 128.9. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 128.10 |
| Mozilla | Thunderbird | — | 128.10 |
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 | 128.10.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.10.0esr-1 | — |
| Debian 13 | firefox-esr | 128.10.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.10.0esr-1 | — |
| Debian 12 | firefox-esr | 128.10.0esr-1~deb12u1 | DSA-5910-1 |
| Debian 12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DSA-5912-1 |
| Debian 11 | firefox-esr | 128.10.1esr-1~deb11u1 | DLA-4172-1 |
| Debian 11 | thunderbird | 1:128.10.1esr-1~deb11u1 | DLA-4167-1 |
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 +1 | 128.10.0-1.el10_0 | RHSA-2025:7507, RHSA-2025:7506 |
| RHEL 9 | firefox +2 | 128.10.0-1.el9_5 | RHSA-2025:7428, RHSA-2025:4460, RHSA-2025:4443 |
| RHEL 8 | firefox +1 | 128.10.0-1.el8_10 | RHSA-2025:4797, RHSA-2025:4458 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.10.0-1.el9_4 | RHSA-2025:7695, RHSA-2025:4756 |
| RHEL 9.2 EUS | firefox +2 | 128.10.0-1.el9_2 | RHSA-2025:7694, RHSA-2025:4752 |
| RHEL 9.0 E4S | firefox +1 | 128.10.0-1.el9_0 | RHSA-2025:7692, RHSA-2025:4753 |
| RHEL 8.8 EUS | firefox +1 | 128.10.0-1.el8_8 | RHSA-2025:7689, RHSA-2025:7543 |
| RHEL 8.6 TUS | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.6 E4S | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.6 AUS | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.4 TUS | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.4 E4S | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.4 AUS | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.2 AUS | firefox +1 | 128.10.0-1.el8_2 | RHSA-2025:7693, RHSA-2025:7547 |
| RHEL 7 ELS | firefox | 128.10.0-1.el7_9 | RHSA-2025:4751 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.10.0-1.el10_0 | ALSA-2025:7506 |
| AlmaLinux 10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux 9 | firefox +2 | 128.10.0-1.el9_5.alma.1 | ALSA-2025:7428, ALSA-2025:4460, ALSA-2025:4443 |
| AlmaLinux 8 | firefox +1 | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4797, ALSA-2025:4458 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox +1 | 128.10.0-1.el9_5 | RLSA-2025:7428, RLSA-2025:4460, RLSA-2025:4443 |
| Rocky Linux 8 | firefox +1 | 128.10.0-1.el8_10 | RLSA-2025:4797, RLSA-2025:4458 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.10.0-150200.8.212.1 | SUSE-SU-2025:1506-1 |
| SLES 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 138.0-1.1 | openSUSE-SU-2025:15045-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 128.10.0-1.1 | openSUSE-SU-2025:15042-1 |
| openSUSE Tumbleweed | firefox-esr | 153.0-1.1 | openSUSE-SU-2026:11373-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.10.0-150200.8.212.1 | SUSE-SU-2025:1506-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 128.10.0-1.amzn2023.0.2 | ALAS2023-2025-976 |
| Amazon Linux 2 | thunderbird | 128.10.0-1.amzn2.0.1 | ALAS2-2025-2858 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 128.11.0-1.0.1.el10_0 | ELSA-2025-7507, ELSA-2025-7506 |
| Oracle Linux 9 | firefox +2 | 128.10.0-1.0.1.el9_5 | ELSA-2025-7428, ELSA-2025-4460, ELSA-2025-4443 |
| Oracle Linux 8 | firefox +1 | 128.10.0-1.0.1.el8_10 | ELSA-2025-4797, ELSA-2025-4458 |
| Oracle Linux 7 | firefox | 128.10.0-1.0.1.el7_9 | ELSA-2025-4751 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.10-r0 | — |
Advisories 50
- ALSA-2025:7506 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7507 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7428 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4460 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4443 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4797 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4458 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- openSUSE-SU-2026:11373-1 firefox-esr-153.0-1.1 on GA media SUSE / openSUSE Security Updates · Jul 26, 2026
- RHSA-2025:7693 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:4458 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:7694 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7695 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7692 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7691 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7689 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7690 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7545 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7547 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7544 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7543 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7506 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7507 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7428 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4797 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4756 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4752 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4753 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4751 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4460 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4443 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-2025:15042-1 MozillaThunderbird-128.10.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15045-1 MozillaFirefox-138.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5912-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5910-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4172-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4167-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:1436-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1506-1 Security update for MozillaThunderbird 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
- ALAS2-2025-2858 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 29, 2025
- ALAS2023-2025-976 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 29, 2025
- WID-SEC-2025-0901 Mozilla Firefox, Firefox ESR, Thunderbird and Thunderbird ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 29, 2025
- RLSA-2025:4443 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4460 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:7428 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4797 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4458 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-7507 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-7506 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
References
- Memory safety bugs fixed in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10
- https://www.mozilla.org/security/advisories/mfsa2025-28/
- https://www.mozilla.org/security/advisories/mfsa2025-29/
- https://www.mozilla.org/security/advisories/mfsa2025-31/
- https://www.mozilla.org/security/advisories/mfsa2025-32/