Description
Memory safety bugs present in Firefox 138, Thunderbird 138, Firefox ESR 128.10, and Thunderbird 128.10. 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 139, Firefox ESR 128.11, Thunderbird 139, and Thunderbird 128.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 128.11 |
| Mozilla | Thunderbird | — | 128.11 |
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 | 128.11.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.11.0esr-1 | — |
| Debian 13 | firefox-esr | 128.11.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.11.0esr-1 | — |
| Debian 12 | firefox-esr | 128.11.0esr-1~deb12u1 | DSA-5926-1 |
| Debian 12 | thunderbird | 1:128.11.0esr-1~deb12u1 | DSA-5932-1 |
| Debian 11 | firefox-esr | 128.11.0esr-1~deb11u1 | DLA-4191-1 |
| 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 +1 | 128.11.0-1.el10_0 | RHSA-2025:8608, RHSA-2025:8341 |
| RHEL 9 | firefox +2 | 128.11.0-1.el9_6 | RHSA-2025:8607, RHSA-2025:8293 |
| RHEL 8 | firefox +1 | 128.11.0-1.el8_10 | RHSA-2025:8756, RHSA-2025:8308 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.11.0-1.el9_4 | RHSA-2025:9072, RHSA-2025:8599 |
| RHEL 9.2 E4S | firefox +2 | 128.11.0-1.el9_2 | RHSA-2025:9071, RHSA-2025:8642 |
| RHEL 9.0 E4S | firefox +1 | 128.11.0-1.el9_0 | RHSA-2025:9073, RHSA-2025:8598 |
| RHEL 8.8 TUS | thunderbird | 128.11.0-1.el8_8 | RHSA-2025:8628 |
| RHEL 8.8 E4S | firefox +1 | 128.11.0-1.el8_8 | RHSA-2025:9077, RHSA-2025:8628 |
| RHEL 8.6 TUS | firefox +1 | 128.11.0-1.el8_6 | RHSA-2025:9155, RHSA-2025:8629 |
| RHEL 8.6 E4S | firefox +1 | 128.11.0-1.el8_6 | RHSA-2025:9155, RHSA-2025:8629 |
| RHEL 8.6 AUS | firefox +1 | 128.11.0-1.el8_6 | RHSA-2025:9155, RHSA-2025:8629 |
| RHEL 8.4 AUS | firefox +1 | 128.11.0-1.el8_4 | RHSA-2025:9076, RHSA-2025:8630 |
| RHEL 8.2 AUS | firefox +1 | 128.11.0-1.el8_2 | RHSA-2025:9075, RHSA-2025:8631 |
| RHEL 7 ELS | firefox | 128.11.0-1.el7_9 | RHSA-2025:9074 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.11.0-1.el10_0 | ALSA-2025:8341 |
| AlmaLinux 10 | thunderbird | 128.11.0-1.el10_0.alma.1 | ALSA-2025:8608 |
| AlmaLinux 9 | firefox +2 | 128.11.0-1.el9_6.alma.1 | ALSA-2025:8607, ALSA-2025:8293 |
| AlmaLinux 8 | firefox +1 | 128.11.0-1.el8_10.alma.1 | ALSA-2025:8756, ALSA-2025:8308 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox +1 | 128.11.0-1.el10_0 | RLSA-2025:8608, RLSA-2025:8341 |
| Rocky Linux 9 | firefox +1 | 128.11.0-1.el9_6 | RLSA-2025:8607, RLSA-2025:8293 |
| Rocky Linux 8 | firefox +1 | 128.11.0-1.el8_10 | RLSA-2025:8756, RLSA-2025:8308 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP7 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
| SLES 15 SP6 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
| SLES 15 SP5 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP4 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 15 SP3 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.11.0-112.262.1 | SUSE-SU-2025:01769-1 |
| SLES for SAP 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLES 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 139.0.1-1.1 | openSUSE-SU-2025:15196-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 128.11.0-1.1 | openSUSE-SU-2025:15174-1, openSUSE-SU-2025:15170-1 |
| openSUSE Tumbleweed | mozjs128 | 128.12.0-1.1 | openSUSE-SU-2025:15315-1 |
| openSUSE Leap 16.0 | mozjs128 | 128.14.0-160000.1.1 | openSUSE-SU-2025:20135-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.11.0-150200.152.185.1 | SUSE-SU-2025:01814-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.11.0-150200.8.221.1 | SUSE-SU-2025:01946-1 |
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-2025-8341 |
| Oracle Linux 9 | firefox +2 | 128.11.0-1.0.1.el9_6 | ELSA-2025-8607, ELSA-2025-8293 |
| Oracle Linux 8 | firefox +1 | 128.11.0-1.0.1.el8_10 | ELSA-2025-8756, ELSA-2025-8308 |
| Oracle Linux 7 | firefox | 128.11.0-1.0.1.el7_9 | ELSA-2025-9074 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.11-r0 | — |
Advisories 50
- ALSA-2025:8308 Important: firefox security update AlmaLinux Security Advisories · Nov 6, 2026
- ALSA-2025:8341 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8608 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8607 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:8293 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-2025:9155 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:9077 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:9076 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:9075 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:9073 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:9074 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:9071 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:9072 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-2025:8631 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-2025:8341 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8308 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:8293 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- WID-SEC-2025-1160 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 10, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:20135-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15315-1 libmozjs-128-0-128.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15196-1 MozillaFirefox-139.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15174-1 MozillaThunderbird-128.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15170-1 firefox-esr-128.11.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:21170-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01769-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:01946-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5932-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4191-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5926-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4194-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:01814-1 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-2025:8341 Important: firefox security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:8608 Important: thunderbird security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:8293 Important: firefox security update Rocky Linux Security Advisories · Oct 4, 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-2025:8308 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-8608 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 27, 2025
References
- Memory safety bugs fixed in Firefox 139, Thunderbird 139, Firefox ESR 128.11, and Thunderbird 128.11
- https://www.mozilla.org/security/advisories/mfsa2025-42/
- https://www.mozilla.org/security/advisories/mfsa2025-44/
- https://www.mozilla.org/security/advisories/mfsa2025-45/
- https://www.mozilla.org/security/advisories/mfsa2025-46/