Description
During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NUL bytes, and cause a potentially exploitable crash. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 118 | 118 |
| Mozilla | Firefox ESR | unspecified – < 115.3 | 115.3 |
| Mozilla | Thunderbird | unspecified – < 115.3 | 115.3 |
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 | 115.3.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.3.0-1 | — |
| Debian 13 | firefox-esr | 115.3.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.3.0-1 | — |
| Debian 12 | firefox-esr | 115.3.0esr-1~deb12u1 | DSA-5506-1 |
| Debian 12 | thunderbird | 1:115.3.1-1~deb12u1 | DSA-5513-1 |
| Debian 11 | firefox-esr | 115.3.0esr-1~deb11u1 | DSA-5506-1 |
| Debian 11 | thunderbird | 1:115.3.1-1~deb11u1 | DSA-5513-1 |
| Debian 10 | firefox-esr | 115.3.0esr-1~deb10u1 | DLA-3587-1 |
| Debian 10 | thunderbird | 1:115.3.1-1~deb10u1 | DLA-3601-1 |
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 | 1:115.3.1+build1-0ubuntu0.22.04.2 | USN-6405-1 |
| Ubuntu 20.04 LTS | firefox | 118.0.1+build1-0ubuntu0.20.04.1 | USN-6404-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:115.3.1+build1-0ubuntu0.20.04.1 | USN-6405-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +2 | 115.3.1-1.el9_2 | RHSA-2023:5435, RHSA-2023:5434 |
| RHEL 8 | firefox +1 | 115.3.1-1.el8_8 | RHSA-2023:5433, RHSA-2023:5428 |
| RHEL 7 | firefox +1 | 115.3.1-1.el7_9 | RHSA-2023:5477, RHSA-2023:5475 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.0 EUS | firefox +1 | 115.3.1-1.el9_0 | RHSA-2023:5439, RHSA-2023:5427 |
| RHEL 8.6 EUS | firefox +1 | 115.3.1-1.el8_6 | RHSA-2023:5436, RHSA-2023:5430 |
| RHEL 8.4 TUS | firefox +1 | 115.3.1-1.el8_4 | RHSA-2023:5437, RHSA-2023:5429 |
| RHEL 8.4 E4S | firefox +1 | 115.3.1-1.el8_4 | RHSA-2023:5437, RHSA-2023:5429 |
| RHEL 8.4 AUS | firefox +1 | 115.3.1-1.el8_4 | RHSA-2023:5437, RHSA-2023:5429 |
| RHEL 8.2 TUS | firefox +1 | 115.3.1-1.el8_2 | RHSA-2023:5432, RHSA-2023:5426 |
| RHEL 8.2 E4S | firefox +1 | 115.3.1-1.el8_2 | RHSA-2023:5432, RHSA-2023:5426 |
| RHEL 8.2 AUS | firefox +1 | 115.3.1-1.el8_2 | RHSA-2023:5432, RHSA-2023:5426 |
| RHEL 8.1 E4S | firefox +1 | 115.3.1-1.el8_1 | RHSA-2023:5440, RHSA-2023:5438 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.3.1-1.el9_2.alma.1 | ALSA-2023:5434 |
| AlmaLinux 9 | thunderbird | 115.3.1-1.el9_2.alma | ALSA-2023:5435 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | thunderbird | 115.3.1-1.el9_2 | RLSA-2023:5435 |
| Rocky Linux 8 | thunderbird | 115.3.1-1.el8_8 | RLSA-2023:5428 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.3.1-150200.8.133.1 | SUSE-SU-2023:4016-1 |
| SLES 15 SP4 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLES 15 SP4 | MozillaThunderbird | 115.3.1-150200.8.133.1 | SUSE-SU-2023:4016-1 |
| SLES 15 SP3 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLES 15 SP2 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLES 15 SP1 | MozillaFirefox | 115.3.0-150000.150.107.1 | SUSE-SU-2023:3899-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | MozillaFirefox | 115.3.0-112.182.1 | SUSE-SU-2023:3837-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLES for SAP 15 SP1 | MozillaFirefox | 115.3.0-150000.150.107.1 | SUSE-SU-2023:3899-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.3.0-112.182.1 | SUSE-SU-2023:3837-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| SLE HPC 15 SP1 | MozillaFirefox | 115.3.0-150000.150.107.1 | SUSE-SU-2023:3899-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 118.0.1-1.1 | openSUSE-SU-2024:13272-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.3.0-1.1 | openSUSE-SU-2024:13268-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.3.1-150200.8.133.1 | SUSE-SU-2023:4016-1 |
| openSUSE Leap 15.4 | MozillaFirefox | 115.3.0-150200.152.108.1 | SUSE-SU-2023:3898-1 |
| openSUSE Leap 15.4 | MozillaThunderbird | 115.3.1-150200.8.133.1 | SUSE-SU-2023:4016-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 115.3.0-r0 | — |
| Alpine v3.22 | firefox-esr | 115.3.0-r0 | — |
| Alpine v3.21 | firefox-esr | 115.3.0-r0 | — |
| Alpine v3.20 | firefox-esr | 115.3.0-r0 | — |
| Alpine v3.19 | firefox-esr | 115.3.0-r0 | — |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 115.3.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +2 | 115.3.1-1.0.1.el9_2 | ELSA-2023-5435, ELSA-2023-5434 |
| Oracle Linux 8 | firefox +1 | 115.3.1-1.0.1.el8_8 | ELSA-2023-5433, ELSA-2023-5428 |
| Oracle Linux 7 | firefox +1 | 115.3.1-1.0.1.el7_9 | ELSA-2023-5477, ELSA-2023-5475 |
Advisories 40
- ALSA-2023:5434 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2023:5435 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2023:5477 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2023:5475 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-6405-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-6404-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- RHSA-2023:5433 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5438 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5440 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5434 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5426 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5435 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5436 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5428 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5437 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5430 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5439 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5427 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5429 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- RHSA-2023:5432 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Mar 18, 2026
- DSA-5506-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5513-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3601-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3587-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2023:5435 Important: thunderbird security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2023:5428 Important: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2023:4016-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3899-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3898-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13268-1 MozillaThunderbird-115.3.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13272-1 MozillaFirefox-118.0.1-1.1 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
- SUSE-SU-2023:3837-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-2448 Mozilla Firefox und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- ELSA-2023-5477 Important: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 13, 2023
- ELSA-2023-5475 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 13, 2023
- ELSA-2023-5428 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 6, 2023
- ELSA-2023-5433 Important: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Oct 6, 2023
- ELSA-2023-5435 Important: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 5, 2023
- ELSA-2023-5434 Important: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 5, 2023
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1851599
- https://www.mozilla.org/security/advisories/mfsa2023-41/
- https://www.mozilla.org/security/advisories/mfsa2023-42/
- https://www.mozilla.org/security/advisories/mfsa2023-43/
- https://www.debian.org/security/2023/dsa-5506
- https://lists.debian.org/debian-lts-announce/2023/09/msg00034.html
- https://www.debian.org/security/2023/dsa-5513
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/AY642Z6JZODQJE7Z62CFREVUHEGCXGPD/
- https://lists.debian.org/debian-lts-announce/2023/10/msg00015.html