Description
Memory safety bugs present in Firefox ESR 115.26, Firefox ESR 128.13, Thunderbird ESR 128.13, Firefox ESR 140.1, Thunderbird ESR 140.1, Firefox 141 and Thunderbird 141. 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 142, Firefox ESR 115.27, Firefox ESR 128.14, Firefox ESR 140.2, Thunderbird 142, Thunderbird 128.14, and Thunderbird 140.2.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 115.27 |
| Mozilla | Thunderbird | — | 128.14 |
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 | 128.14.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.14.0esr-1 | — |
| Debian 13 | firefox-esr | 128.14.0esr-1~deb13u1 | DSA-5980-1 |
| Debian 13 | thunderbird | 1:128.14.0esr-1~deb13u1 | DSA-5984-1 |
| Debian 12 | firefox-esr | 128.14.0esr-1~deb12u1 | DSA-5980-1 |
| Debian 12 | thunderbird | 1:128.14.0esr-1~deb12u1 | DSA-5984-1 |
| Debian 11 | firefox-esr | 128.14.0esr-1~deb11u1 | DLA-4277-1 |
| Debian 11 | thunderbird | 1:128.14.0esr-1~deb11u1 | DLA-4279-1 |
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 | 1:140.7.1+build1-0ubuntu0.22.04.1 | — |
| 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 | 128.14.0-2.el10_0 | RHSA-2025:14417 |
| RHEL 10 | thunderbird | 128.14.0-3.el10_0 | RHSA-2025:14844 |
| RHEL 9 | firefox +1 | 128.14.0-2.el9_6 | RHSA-2025:14416 |
| RHEL 9 | thunderbird | 128.14.0-3.el9_6 | RHSA-2025:14640 |
| RHEL 8 | firefox | 128.14.0-2.el8_10 | RHSA-2025:14442 |
| RHEL 8 | thunderbird | 128.14.0-3.el8_10 | RHSA-2025:14743 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +1 | 128.14.0-2.el9_4 | RHSA-2025:15423 |
| RHEL 9.4 EUS | thunderbird | 128.14.0-3.el9_4 | RHSA-2025:15434 |
| RHEL 9.2 E4S | firefox +1 | 128.14.0-2.el9_2 | RHSA-2025:15421 |
| RHEL 9.2 E4S | thunderbird | 128.14.0-3.el9_2 | RHSA-2025:15435 |
| RHEL 9.0 E4S | firefox | 128.14.0-2.el9_0 | RHSA-2025:15420 |
| RHEL 9.0 E4S | thunderbird | 128.14.0-3.el9_0 | RHSA-2025:15436 |
| RHEL 8.8 TUS | firefox | 128.14.0-2.el8_8 | RHSA-2025:15424 |
| RHEL 8.8 TUS | thunderbird | 128.14.0-3.el8_8 | RHSA-2025:15438 |
| RHEL 8.8 E4S | firefox | 128.14.0-2.el8_8 | RHSA-2025:15424 |
| RHEL 8.8 E4S | thunderbird | 128.14.0-3.el8_8 | RHSA-2025:15438 |
| RHEL 8.6 TUS | firefox | 128.14.0-2.el8_6 | RHSA-2025:15422 |
| RHEL 8.6 TUS | thunderbird | 128.14.0-3.el8_6 | RHSA-2025:15535 |
| RHEL 8.6 E4S | firefox | 128.14.0-2.el8_6 | RHSA-2025:15422 |
| RHEL 8.6 E4S | thunderbird | 128.14.0-3.el8_6 | RHSA-2025:15535 |
| RHEL 8.6 AUS | firefox | 128.14.0-2.el8_6 | RHSA-2025:15422 |
| RHEL 8.6 AUS | thunderbird | 128.14.0-3.el8_6 | RHSA-2025:15535 |
| RHEL 8.4 EUS Long Life | firefox | 128.14.0-2.el8_4 | RHSA-2025:15419 |
| RHEL 8.4 EUS Long Life | thunderbird | 128.14.0-3.el8_4 | RHSA-2025:15496 |
| RHEL 8.4 AUS | firefox | 128.14.0-2.el8_4 | RHSA-2025:15419 |
| RHEL 8.4 AUS | thunderbird | 128.14.0-3.el8_4 | RHSA-2025:15496 |
| RHEL 8.2 AUS | firefox | 128.14.0-2.el8_2 | RHSA-2025:15418 |
| RHEL 8.2 AUS | thunderbird | 128.14.0-3.el8_2 | RHSA-2025:15437 |
| RHEL 7 ELS | firefox | 128.14.0-2.el7_9 | RHSA-2025:15430 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.14.0-2.el10_0 | ALSA-2025:14417 |
| AlmaLinux 10 | thunderbird | 128.14.0-3.el10_0.alma.1 | ALSA-2025:14844 |
| AlmaLinux 9 | firefox +1 | 128.14.0-2.el9_6.alma.1 | ALSA-2025:14416 |
| AlmaLinux 9 | thunderbird | 128.14.0-3.el9_6.alma.1 | ALSA-2025:14640 |
| AlmaLinux 8 | firefox | 128.14.0-2.el8_10.alma.1 | ALSA-2025:14442 |
| AlmaLinux 8 | thunderbird | 128.14.0-3.el8_10.alma.1 | ALSA-2025:14743 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | firefox | 128.14.0-2.el10_0 | RLSA-2025:14417 |
| Rocky Linux 10 | thunderbird | 128.14.0-3.el10_0 | RLSA-2025:14844 |
| Rocky Linux 9 | firefox | 128.14.0-2.el9_6 | RLSA-2025:14416 |
| Rocky Linux 8 | firefox | 128.14.0-2.el8_10 | RLSA-2025:14442 |
| Rocky Linux 8 | thunderbird | 128.14.0-3.el8_10 | RLSA-2025:14743 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES 15 SP7 | MozillaThunderbird | 140.2.0-150200.8.236.1 | SUSE-SU-2025:03007-1 |
| SLES 15 SP6 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES 15 SP6 | MozillaThunderbird | 140.2.0-150200.8.236.1 | SUSE-SU-2025:03007-1 |
| SLES 15 SP5 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES 15 SP4 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES 15 SP3 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 140.2.0-112.276.1 | SUSE-SU-2025:03009-1 |
| SLES for SAP 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLES for SAP 15 SP5 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLES 16.0 | mozjs128 | 128.14.0-160000.1.1 | SUSE-SU-2025:21170-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 142.0.1-1.1 | openSUSE-SU-2025:15516-1 |
| openSUSE Tumbleweed | firefox-esr +1 | 140.2.0-1.1 | openSUSE-SU-2025:15472-1, openSUSE-SU-2025:15467-1 |
| openSUSE Tumbleweed | mozjs128 | 128.14.0-1.1 | openSUSE-SU-2025:15494-1 |
| openSUSE Leap 16.0 | mozjs128 | 128.14.0-160000.1.1 | openSUSE-SU-2025:20135-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 140.2.0-150200.152.198.1 | SUSE-SU-2025:03008-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 140.2.0-150200.8.236.1 | SUSE-SU-2025:03007-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 140.2.0-1.amzn2023.0.1 | ALAS2023-2025-1171 |
| Amazon Linux 2 | thunderbird | 140.2.0-1.amzn2.0.1 | ALAS2-2025-2999 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox | 128.14.0-2.0.1.el10_0 | ELSA-2025-14417 |
| Oracle Linux 10 | thunderbird | 128.14.0-3.0.1.el10_0 | ELSA-2025-14844 |
| Oracle Linux 9 | firefox +1 | 128.14.0-2.0.1.el9_6 | ELSA-2025-14416 |
| Oracle Linux 9 | thunderbird | 128.14.0-3.0.1.el9_6 | ELSA-2025-14640 |
| Oracle Linux 8 | firefox | 128.14.0-2.0.1.el8_10 | ELSA-2025-14442 |
| Oracle Linux 8 | thunderbird | 128.14.0-3.0.1.el8_10 | ELSA-2025-14743 |
| Oracle Linux 7 | firefox | 128.14.0-2.0.1.el7_9 | ELSA-2025-15430 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.14-r0 | — |
Advisories 50
- ALSA-2025:14417 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:14844 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:14416 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:14640 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:14442 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:14743 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:15535 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15496 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15438 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15436 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15437 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15434 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15435 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15430 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15423 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15424 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15421 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15422 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15420 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15418 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:15419 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:14844 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:14743 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:14640 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:14442 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:14417 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:14416 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- WID-SEC-2025-1866 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 15, 2026
- openSUSE-SU-2025:20135-1 Security update for mozjs128 SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15516-1 MozillaFirefox-142.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15494-1 libmozjs-128-0-128.14.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15467-1 firefox-esr-140.2.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15472-1 MozillaThunderbird-140.2.0-1.1 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
- DSA-5984-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4277-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4279-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5980-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:03009-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:03008-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:03007-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2025:14416 Important: firefox security update Rocky Linux Security Advisories · Oct 10, 2025
- RLSA-2025:14844 Important: thunderbird security update Rocky Linux Security Advisories · Oct 8, 2025
- RLSA-2025:14417 Important: firefox security update Rocky Linux Security Advisories · Oct 8, 2025
- ELSA-2025-15430 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 22, 2025
- ALAS2-2025-2999 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Sep 16, 2025
- RLSA-2025:14442 Important: firefox security update Rocky Linux Security Advisories · Sep 8, 2025
- RLSA-2025:14743 Important: thunderbird security update Rocky Linux Security Advisories · Sep 8, 2025
- ALAS2023-2025-1171 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 8, 2025
- ELSA-2025-14844 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Aug 28, 2025
References
- Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142
- https://www.mozilla.org/security/advisories/mfsa2025-64/
- https://www.mozilla.org/security/advisories/mfsa2025-65/
- https://www.mozilla.org/security/advisories/mfsa2025-66/
- https://www.mozilla.org/security/advisories/mfsa2025-67/
- https://www.mozilla.org/security/advisories/mfsa2025-70/
- https://www.mozilla.org/security/advisories/mfsa2025-71/
- https://www.mozilla.org/security/advisories/mfsa2025-72/