Description
Memory safety bugs present in Firefox 118, Firefox ESR 115.3, and Thunderbird 115.3. 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 < 119, Firefox ESR < 115.4, and Thunderbird < 115.4.1.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 119 | 119 |
| Mozilla | Firefox ESR | unspecified – < 115.4 | 115.4 |
| Mozilla | Thunderbird | unspecified – < 115.4.1 | 115.4.1 |
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 | 115.4.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.4.1-1 | — |
| Debian 13 | firefox-esr | 115.4.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.4.1-1 | — |
| Debian 12 | firefox-esr | 115.4.0esr-1~deb12u1 | DSA-5535-1 |
| Debian 12 | thunderbird | 1:115.4.1-1~deb12u1 | DSA-5538-1 |
| Debian 11 | firefox-esr | 115.4.0esr-1~deb11u1 | DSA-5535-1 |
| Debian 11 | thunderbird | 1:115.4.1-1~deb11u1 | DSA-5538-1 |
| Debian 10 | firefox-esr | 115.4.0esr-1~deb10u1 | DLA-3632-1 |
| Debian 10 | thunderbird | 1:115.4.1-1~deb10u1 | DLA-3637-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 | No fix yet | — |
| Ubuntu 24.04 LTS | thunderbird | 1:115.4.1+build1-0ubuntu1 | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:115.4.1+build1-0ubuntu0.22.04.1 | USN-6468-1 |
| Ubuntu 20.04 LTS | firefox | 119.0+build2-0ubuntu0.20.04.1 | USN-6456-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:115.4.1+build1-0ubuntu0.20.04.1 | USN-6468-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +1 | 115.4.0-1.el9_2 | RHSA-2023:6188 |
| RHEL 9 | thunderbird | 115.4.1-1.el9_2 | RHSA-2023:6191 |
| RHEL 8 | firefox | 115.4.0-1.el8_8 | RHSA-2023:6187 |
| RHEL 8 | thunderbird | 115.4.1-1.el8_8 | RHSA-2023:6194 |
| RHEL 7 | firefox | 115.4.0-1.el7_9 | RHSA-2023:6162 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | firefox | 115.4.0-1.el9_0 | RHSA-2023:6199 |
| RHEL 8.6 EUS | firefox | 115.4.0-1.el8_6 | RHSA-2023:6186 |
| RHEL 8.6 EUS | thunderbird | 115.4.1-1.el8_6 | RHSA-2023:6195 |
| RHEL 8.4 TUS | thunderbird | 115.4.1-1.el8_4 | RHSA-2023:6196 |
| RHEL 8.4 E4S | thunderbird | 115.4.1-1.el8_4 | RHSA-2023:6196 |
| RHEL 8.4 AUS | thunderbird | 115.4.1-1.el8_4 | RHSA-2023:6196 |
| RHEL 8.2 TUS | firefox | 115.4.0-1.el8_2 | RHSA-2023:6185 |
| RHEL 8.2 TUS | thunderbird | 115.4.1-1.el8_2 | RHSA-2023:6197 |
| RHEL 8.2 E4S | firefox | 115.4.0-1.el8_2 | RHSA-2023:6185 |
| RHEL 8.2 E4S | thunderbird | 115.4.1-1.el8_2 | RHSA-2023:6197 |
| RHEL 8.2 AUS | firefox | 115.4.0-1.el8_2 | RHSA-2023:6185 |
| RHEL 8.2 AUS | thunderbird | 115.4.1-1.el8_2 | RHSA-2023:6197 |
| RHEL 8.1 E4S | firefox | 115.4.0-1.el8_1 | RHSA-2023:6189 |
| RHEL 8.1 E4S | thunderbird | 115.4.1-1.el8_1 | RHSA-2023:6198 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.4.0-1.el9_2.alma.1 | ALSA-2023:6188 |
| AlmaLinux 9 | thunderbird | 115.4.1-1.el9_2.alma | ALSA-2023:6191 |
| AlmaLinux 8 | firefox | 115.4.0-1.el8_8.alma.1 | ALSA-2023:6187 |
| AlmaLinux 8 | thunderbird | 115.4.1-1.el8_8.alma.1 | ALSA-2023:6194 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox | 115.4.0-1.el9_2 | RLSA-2023:6188 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
| SLES 15 SP4 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLES 15 SP4 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
| SLES 15 SP3 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLES 15 SP2 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLES 15 SP1 | MozillaFirefox | 115.4.0-150000.150.113.1 | SUSE-SU-2023:4533-1, SUSE-SU-2023:4213-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.4.0-112.188.1 | SUSE-SU-2023:4532-1, SUSE-SU-2023:4212-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 115.4.0-150000.150.113.1 | SUSE-SU-2023:4533-1, SUSE-SU-2023:4213-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.4.0-112.188.1 | SUSE-SU-2023:4532-1, SUSE-SU-2023:4212-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 115.4.0-150000.150.113.1 | SUSE-SU-2023:4533-1, SUSE-SU-2023:4213-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 119.0-1.1 | openSUSE-SU-2024:13385-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.4.1-1.1 | openSUSE-SU-2024:13356-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 115.4.0-150200.152.114.1 | SUSE-SU-2023:4551-1, SUSE-SU-2023:4214-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 115.4.1-150200.8.136.1 | SUSE-SU-2023:4302-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 119.0-r0 | — |
| Alpine v3.23 | firefox +1 | 119.0-r0 | — |
| Alpine v3.23 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.23 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.22 | firefox +1 | 119.0-r0 | — |
| Alpine v3.22 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.22 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.21 | firefox | 119.0-r0 | — |
| Alpine v3.21 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.21 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.20 | firefox | 119.0-r0 | — |
| Alpine v3.20 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.20 | thunderbird | 115.4.1-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 119.0-r0 | — |
| Alpine v3.19 | firefox-esr | 115.4.0-r0 | — |
| Alpine v3.19 | thunderbird | 115.4.1-r0 | — |
| Alpine v3.18 | firefox | 119.0-r0 | — |
| Alpine v3.18 | firefox-esr | 115.5.0-r0 | — |
| Alpine v3.18 | thunderbird | 115.4.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.4.1-1.amzn2.0.1 | ALAS2-2023-2334 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +1 | 115.4.0-1.0.1.el9_2 | ELSA-2023-6188 |
| Oracle Linux 9 | thunderbird | 115.4.1-1.0.1.el9_2 | ELSA-2023-6191 |
| Oracle Linux 8 | firefox | 115.4.0-1.0.1.el8_8 | ELSA-2023-6187 |
| Oracle Linux 8 | thunderbird | 115.4.1-1.0.1.el8_8 | ELSA-2023-6194 |
| Oracle Linux 7 | firefox | 115.4.0-1.0.1.el7_9 | ELSA-2023-6162 |
| Oracle Linux 7 | thunderbird | 115.4.1-1.0.1.el7_9 | ELSA-2023-6193 |
Advisories 42
- ALSA-2023:6188 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6191 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6187 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:6194 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:6162 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6456-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-6468-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- RHSA-2023:6198 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6195 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6196 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6197 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6189 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6194 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6186 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6199 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6188 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6191 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6185 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:6187 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5535-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5538-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3632-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3637-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:6188 Important: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2023:4532-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4533-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4214-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4212-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4551-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13385-1 MozillaFirefox-119.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13356-1 MozillaThunderbird-115.4.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:4213-1 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-2023:4302-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2743 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- ALAS2-2023-2334 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 15, 2023
- ELSA-2023-6194 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6193 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6191 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6188 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 31, 2023
- ELSA-2023-6162 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 30, 2023
- ELSA-2023-6187 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 30, 2023
References
- Memory safety bugs fixed in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4.1
- https://www.mozilla.org/security/advisories/mfsa2023-45/
- https://www.mozilla.org/security/advisories/mfsa2023-46/
- https://www.mozilla.org/security/advisories/mfsa2023-47/
- https://www.debian.org/security/2023/dsa-5535
- https://lists.debian.org/debian-lts-announce/2023/10/msg00037.html
- https://www.debian.org/security/2023/dsa-5538
- https://lists.debian.org/debian-lts-announce/2023/10/msg00042.html