Description
Memory safety bugs present in Firefox 126, Firefox ESR 115.11, and Thunderbird 115.11. 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 < 127, Firefox ESR < 115.12, and Thunderbird < 115.12.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 127 | 127 |
| Mozilla | Firefox ESR | unspecified – < 115.12 | 115.12 |
| Mozilla | Thunderbird | unspecified – < 115.12 | 115.12 |
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 | 115.12.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.12.0-1 | — |
| Debian 13 | firefox-esr | 115.12.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.12.0-1 | — |
| Debian 12 | firefox-esr | 115.12.0esr-1~deb12u1 | DSA-5709-1 |
| Debian 12 | thunderbird | 1:115.12.0-1~deb12u1 | DSA-5711-1 |
| Debian 11 | firefox-esr | 115.12.0esr-1~deb11u1 | DSA-5709-1 |
| Debian 11 | thunderbird | 1:115.12.0-1~deb11u1 | DSA-5711-1 |
| Debian 10 | firefox-esr | 115.12.0esr-1~deb10u1 | DLA-3825-1 |
| Debian 10 | thunderbird | 1:115.12.0-1~deb10u1 | DLA-3836-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:115.12.0+build3-0ubuntu0.22.04.1 | USN-6840-1 |
| Ubuntu 20.04 LTS | firefox | 127.0.2+build1-0ubuntu0.20.04.1 | USN-6862-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:115.12.0+build3-0ubuntu0.20.04.1 | USN-6840-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +1 | 115.12.0-1.el9_4 | RHSA-2024:3955 |
| RHEL 9 | thunderbird | 115.12.1-1.el9_4 | RHSA-2024:4002 |
| RHEL 8 | firefox | 115.12.0-1.el8_10 | RHSA-2024:3954 |
| RHEL 8 | thunderbird | 115.12.1-1.el8_10 | RHSA-2024:4036 |
| RHEL 7 | firefox | 115.12.0-1.el7_9 | RHSA-2024:3951 |
| RHEL 7 | thunderbird | 115.12.1-1.el7_9 | RHSA-2024:4016 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | firefox +1 | 115.12.0-1.el9_2 | RHSA-2024:3949 |
| RHEL 9.2 EUS | thunderbird | 115.12.1-1.el9_2 | RHSA-2024:4004 |
| RHEL 9.0 E4S | firefox | 115.12.0-1.el9_0 | RHSA-2024:3958 |
| RHEL 9.0 E4S | thunderbird | 115.12.1-1.el9_0 | RHSA-2024:4015 |
| RHEL 8.8 EUS | firefox | 115.12.0-1.el8_8 | RHSA-2024:3950 |
| RHEL 8.8 EUS | thunderbird | 115.12.1-1.el8_8 | RHSA-2024:4018 |
| RHEL 8.6 TUS | firefox | 115.12.0-1.el8_6 | RHSA-2024:3972 |
| RHEL 8.6 TUS | thunderbird | 115.12.1-1.el8_6 | RHSA-2024:4063 |
| RHEL 8.6 E4S | firefox | 115.12.0-1.el8_6 | RHSA-2024:3972 |
| RHEL 8.6 E4S | thunderbird | 115.12.1-1.el8_6 | RHSA-2024:4063 |
| RHEL 8.6 AUS | firefox | 115.12.0-1.el8_6 | RHSA-2024:3972 |
| RHEL 8.6 AUS | thunderbird | 115.12.1-1.el8_6 | RHSA-2024:4063 |
| RHEL 8.4 TUS | firefox | 115.12.0-1.el8_4 | RHSA-2024:3953 |
| RHEL 8.4 TUS | thunderbird | 115.12.1-1.el8_4 | RHSA-2024:4003 |
| RHEL 8.4 E4S | firefox | 115.12.0-1.el8_4 | RHSA-2024:3953 |
| RHEL 8.4 E4S | thunderbird | 115.12.1-1.el8_4 | RHSA-2024:4003 |
| RHEL 8.4 AUS | firefox | 115.12.0-1.el8_4 | RHSA-2024:3953 |
| RHEL 8.4 AUS | thunderbird | 115.12.1-1.el8_4 | RHSA-2024:4003 |
| RHEL 8.2 AUS | firefox | 115.12.0-1.el8_2 | RHSA-2024:3952 |
| RHEL 8.2 AUS | thunderbird | 115.12.1-1.el8_2 | RHSA-2024:4001 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.12.0-1.el9_4.alma.1 | ALSA-2024:3955 |
| AlmaLinux 9 | thunderbird | 115.12.1-1.el9_4.alma.1 | ALSA-2024:4002 |
| AlmaLinux 8 | firefox | 115.12.0-1.el8_10.alma.1 | ALSA-2024:3954 |
| AlmaLinux 8 | thunderbird | 115.12.1-1.el8_10.alma.1 | ALSA-2024:4036 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox | 115.12.0-1.el9_4 | RLSA-2024:3955 |
| Rocky Linux 9 | thunderbird | 115.12.1-1.el9_4 | RLSA-2024:4002 |
| Rocky Linux 8 | firefox | 115.12.0-1.el8_10 | RLSA-2024:3954 |
| Rocky Linux 8 | thunderbird | 115.12.1-1.el8_10 | RLSA-2024:4036 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP6 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
| SLES 15 SP5 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
| SLES 15 SP4 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP3 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES 15 SP2 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.12.0-112.215.1 | SUSE-SU-2024:2371-1, SUSE-SU-2024:2012-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.12.0-112.215.1 | SUSE-SU-2024:2371-1, SUSE-SU-2024:2012-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 127.0-1.1 | openSUSE-SU-2024:14044-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.12.0-1.1 | openSUSE-SU-2024:14049-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.12.0-150200.152.140.2 | SUSE-SU-2024:2399-1, SUSE-SU-2024:2061-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.12.0-150200.8.163.1 | SUSE-SU-2024:2073-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.12.1-1.amzn2.0.1 | ALAS2-2024-2583 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +1 | 115.12.0-1.0.1.el9_4 | ELSA-2024-3955 |
| Oracle Linux 9 | thunderbird | 115.12.1-1.0.1.el9_4 | ELSA-2024-4002 |
| Oracle Linux 8 | firefox | 115.12.0-1.0.1.el8_10 | ELSA-2024-3954 |
| Oracle Linux 8 | thunderbird | 115.12.1-1.0.1.el8_10 | ELSA-2024-4036 |
| Oracle Linux 7 | firefox | 115.12.0-1.0.1.el7_9 | ELSA-2024-3951 |
| Oracle Linux 7 | thunderbird | 115.12.1-1.0.1.el7_9 | ELSA-2024-4016 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 127.0.2-r0 | — |
Advisories 48
- ALSA-2024:4002 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:3955 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:4036 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:3954 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:4016 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2024:3951 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6862-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-6840-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- RHSA-2024:3953 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4036 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4001 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4002 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4018 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4063 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4003 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4004 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:4015 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3955 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3954 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3958 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3949 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3972 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3950 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2024:3952 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5709-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5711-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3825-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3836-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:3954 Important: firefox security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2024:3955 Important: firefox security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2024:4036 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- RLSA-2024:4002 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- openSUSE-SU-2024:14044-1 MozillaFirefox-127.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2073-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2399-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2061-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:14049-1 MozillaThunderbird-115.12.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:2371-1 Security update for MozillaFirefox 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
- SUSE-SU-2024:2012-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2024-1346 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- ALAS2-2024-2583 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 11, 2024
- ELSA-2024-4016 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 20, 2024
- ELSA-2024-4002 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 20, 2024
- ELSA-2024-4036 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 20, 2024
- ELSA-2024-3955 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 17, 2024
- ELSA-2024-3954 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jun 17, 2024
- ELSA-2024-3951 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jun 17, 2024
References
- Memory safety bugs fixed in Firefox 127, Firefox ESR 115.12, and Thunderbird 115.12
- https://lists.debian.org/debian-lts-announce/2024/06/msg00000.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00010.html
- https://www.mozilla.org/security/advisories/mfsa2024-25/
- https://www.mozilla.org/security/advisories/mfsa2024-26/
- https://www.mozilla.org/security/advisories/mfsa2024-28/