Description
Memory safety bugs present in Firefox 132, Firefox ESR 128.4, and Thunderbird 128.4. 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 affects Firefox < 133, Firefox ESR < 128.5, Thunderbird < 133, and Thunderbird < 128.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 133 | 133 |
| Mozilla | Firefox ESR | unspecified – < 128.5 | 128.5 |
| Mozilla | Thunderbird | unspecified – < 133, unspecified – < 128.5 | 133 |
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 | 128.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.5.0esr-1 | — |
| Debian 13 | firefox-esr | 128.5.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.5.0esr-1 | — |
| Debian 12 | firefox-esr | 128.5.0esr-1~deb12u1 | DSA-5820-1 |
| Debian 12 | thunderbird | 1:128.5.0esr-1~deb12u1 | DSA-5821-1 |
| Debian 11 | firefox-esr | 128.5.0esr-1~deb11u1 | DLA-3971-1 |
| Debian 11 | thunderbird | 1:128.5.0esr-1~deb11u1 | DLA-3969-1 |
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 20.04 LTS | firefox | 133.0+build2-0ubuntu0.20.04.1 | USN-7134-1 |
| 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 | qemu-img +19 | 18:10.1.0-16.el10_2 | RHSA-2026:18479 |
| RHEL 9 | firefox +1 | 128.5.1-1.el9_5 | RHSA-2024:10702 |
| RHEL 9 | thunderbird | 128.5.0-1.el9_5 | RHSA-2024:10592 |
| RHEL 8 | firefox | 128.5.1-1.el8_10 | RHSA-2024:10752 |
| RHEL 8 | thunderbird | 128.5.0-1.el8_10 | RHSA-2024:10591 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +1 | 128.5.1-1.el9_4 | RHSA-2024:10742 |
| RHEL 9.4 EUS | thunderbird | 128.5.0-1.el9_4 | RHSA-2024:10748 |
| RHEL 9.2 EUS | firefox +1 | 128.5.1-1.el9_2 | RHSA-2024:10745 |
| RHEL 9.2 EUS | thunderbird | 128.5.0-1.el9_2 | RHSA-2024:10667 |
| RHEL 9.0 E4S | firefox | 128.5.1-1.el9_0 | RHSA-2024:10743 |
| RHEL 9.0 E4S | thunderbird | 128.5.0-1.el9_0 | RHSA-2024:10703 |
| RHEL 8.8 EUS | firefox | 128.5.1-1.el8_8 | RHSA-2024:10848 |
| RHEL 8.8 EUS | thunderbird | 128.5.0-1.el8_8 | RHSA-2024:10710 |
| RHEL 8.6 TUS | firefox | 128.5.1-1.el8_6 | RHSA-2024:10880 |
| RHEL 8.6 TUS | thunderbird | 128.5.0-1.el8_6 | RHSA-2024:10734 |
| RHEL 8.6 E4S | firefox | 128.5.1-1.el8_6 | RHSA-2024:10880 |
| RHEL 8.6 E4S | thunderbird | 128.5.0-1.el8_6 | RHSA-2024:10734 |
| RHEL 8.6 AUS | firefox | 128.5.1-1.el8_6 | RHSA-2024:10880 |
| RHEL 8.6 AUS | thunderbird | 128.5.0-1.el8_6 | RHSA-2024:10734 |
| RHEL 8.4 TUS | firefox | 128.5.1-1.el8_4 | RHSA-2024:10849 |
| RHEL 8.4 TUS | thunderbird | 128.5.0-1.el8_4 | RHSA-2024:10733 |
| RHEL 8.4 E4S | firefox | 128.5.1-1.el8_4 | RHSA-2024:10849 |
| RHEL 8.4 E4S | thunderbird | 128.5.0-1.el8_4 | RHSA-2024:10733 |
| RHEL 8.4 AUS | firefox | 128.5.1-1.el8_4 | RHSA-2024:10849 |
| RHEL 8.4 AUS | thunderbird | 128.5.0-1.el8_4 | RHSA-2024:10733 |
| RHEL 8.2 AUS | firefox | 128.5.1-1.el8_2 | RHSA-2024:10844 |
| RHEL 8.2 AUS | thunderbird | 128.5.0-1.el8_2 | RHSA-2024:10704 |
| RHEL 7 ELS | firefox | 128.5.1-1.el7_9 | RHSA-2024:10881 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | qemu-img +19 | 18:10.1.0-16.el10_2.alma.1 | ALSA-2026:18479 |
| AlmaLinux 9 | firefox +1 | 128.5.1-1.el9_5 | ALSA-2024:10702 |
| AlmaLinux 9 | thunderbird | 128.5.0-1.el9_5.alma.1 | ALSA-2024:10592 |
| AlmaLinux 8 | firefox | 128.5.1-1.el8_10 | ALSA-2024:10752 |
| AlmaLinux 8 | thunderbird | 128.5.0-1.el8_10.alma.1 | ALSA-2024:10591 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | qemu-kvm | 8:10.1.0-16.el10_2 | RLSA-2026:18479 |
| Rocky Linux 8 | firefox | 128.5.1-1.el8_10 | RLSA-2024:10752 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
| SLES 15 SP5 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP5 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
| SLES 15 SP4 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP3 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES 15 SP2 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 128.5.0-112.237.2 | SUSE-SU-2024:4074-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 133.0.3-1.1 | openSUSE-SU-2024:14583-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 128.5.0-1.1 | openSUSE-SU-2024:14533-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 128.5.0-150200.152.161.1 | SUSE-SU-2024:4086-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 128.5.0-150200.8.191.1 | SUSE-SU-2024:4148-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | thunderbird | 128.5.0-r0 | — |
| Alpine v3.22 | thunderbird | 128.5.0-r0 | — |
| Alpine v3.21 | thunderbird | 128.5.0-r0 | — |
| Alpine v3.20 | thunderbird | 128.5.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | qemu-img +18 | 18:10.1.0-16.el10_2 | ELSA-2026-18479 |
| Oracle Linux 9 | firefox +1 | 128.5.1-1.0.1.el9_5 | ELSA-2024-10702 |
| Oracle Linux 9 | thunderbird | 128.5.0-1.0.1.el9_5 | ELSA-2024-10592 |
| Oracle Linux 8 | firefox | 128.5.1-1.0.1.el8_10 | ELSA-2024-10752 |
| Oracle Linux 8 | thunderbird | 128.5.0-1.0.1.el8_10 | ELSA-2024-10591 |
| Oracle Linux 7 | firefox | 128.5.1-1.0.1.el7_9 | ELSA-2024-10881 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 133.0-r0 | — |
Advisories 45
- ALSA-2024:10592 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:10702 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2026:18479 Important: qemu-kvm security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:10591 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:10752 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2026:18479 Red Hat Security Advisory: qemu-kvm security update Red Hat Security Advisories (RHSA) · Jul 12, 2026
- ELSA-2026-18479 Important: qemu-kvm security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jul 8, 2026
- WID-SEC-2024-3549 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · May 31, 2026
- RLSA-2026:18479 Important: qemu-kvm security update Rocky Linux Security Advisories · May 29, 2026
- RHSA-2024:10881 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10849 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10880 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10848 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10752 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10844 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10748 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10743 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10745 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10734 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10742 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10733 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10704 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10710 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10703 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10667 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10702 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10591 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- RHSA-2024:10592 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · May 20, 2026
- USN-7134-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5820-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5821-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3969-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3971-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:10752 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2024:4074-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4148-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14583-1 MozillaFirefox-133.0.3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:4086-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14533-1 MozillaThunderbird-128.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ELSA-2024-10881 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 16, 2024
- ELSA-2024-10702 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
- ELSA-2024-10592 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
- ELSA-2024-10752 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
- ELSA-2024-10591 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 3, 2024
References
- Memory safety bugs fixed in Firefox 133, Firefox ESR 128.5, and Thunderbird 128.5
- https://www.mozilla.org/security/advisories/mfsa2024-63/
- https://www.mozilla.org/security/advisories/mfsa2024-64/
- https://www.mozilla.org/security/advisories/mfsa2024-67/
- https://www.mozilla.org/security/advisories/mfsa2024-68/