Description
Memory safety bugs present in Firefox 123, Firefox ESR 115.8, and Thunderbird 115.8. 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 < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 124 | 124 |
| Mozilla | Firefox ESR | unspecified – < 115.9 | 115.9 |
| Mozilla | Thunderbird | unspecified – < 115.9 | 115.9 |
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 | 115.9.0esr-1 | — |
| Debian 14 | thunderbird | 1:115.9.0-1 | — |
| Debian 13 | firefox-esr | 115.9.0esr-1 | — |
| Debian 13 | thunderbird | 1:115.9.0-1 | — |
| Debian 12 | firefox-esr | 115.9.0esr-1~deb12u1 | DSA-5643-1 |
| Debian 12 | thunderbird | 1:115.9.0-1~deb12u1 | DSA-5644-1 |
| Debian 11 | firefox-esr | 115.9.0esr-1~deb11u1 | DSA-5643-1 |
| Debian 11 | thunderbird | 1:115.9.0-1~deb11u1 | DSA-5644-1 |
| Debian 10 | firefox-esr | 115.9.1esr-1~deb10u1 | DLA-3775-1 |
| Debian 10 | thunderbird | 1:115.9.0-1~deb10u1 | DLA-3769-1 |
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 | 1:115.9.0+build1-0ubuntu0.22.04.1 | USN-6717-1 |
| Ubuntu 20.04 LTS | firefox | 124.0+build1-0ubuntu0.20.04.1 | USN-6703-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:115.9.0+build1-0ubuntu0.20.04.1 | USN-6717-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | firefox +1 | 115.9.1-1.el9_3 | RHSA-2024:1485 |
| RHEL 9 | thunderbird | 115.9.0-1.el9_3 | RHSA-2024:1493 |
| RHEL 8 | firefox | 115.9.1-1.el8_9 | RHSA-2024:1484 |
| RHEL 8 | thunderbird | 115.9.0-1.el8_9 | RHSA-2024:1494 |
| RHEL 7 | firefox | 115.9.1-1.el7_9 | RHSA-2024:1486 |
| RHEL 7 | thunderbird | 115.9.0-1.el7_9 | RHSA-2024:1498 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 EUS | firefox +1 | 115.9.1-1.el9_2 | RHSA-2024:1483 |
| RHEL 9.2 EUS | thunderbird | 115.9.0-1.el9_2 | RHSA-2024:1492 |
| RHEL 9.0 EUS | firefox | 115.9.1-1.el9_0 | RHSA-2024:1487 |
| RHEL 9.0 EUS | thunderbird | 115.9.0-1.el9_0 | RHSA-2024:1495 |
| RHEL 8.8 EUS | firefox | 115.9.1-1.el8_8 | RHSA-2024:1488 |
| RHEL 8.8 EUS | thunderbird | 115.9.0-1.el8_8 | RHSA-2024:1496 |
| RHEL 8.6 EUS | firefox | 115.9.1-1.el8_6 | RHSA-2024:1489 |
| RHEL 8.6 EUS | thunderbird | 115.9.0-1.el8_6 | RHSA-2024:1497 |
| RHEL 8.4 TUS | firefox | 115.9.1-1.el8_4 | RHSA-2024:1491 |
| RHEL 8.4 TUS | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.4 E4S | firefox | 115.9.1-1.el8_4 | RHSA-2024:1491 |
| RHEL 8.4 E4S | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.4 AUS | firefox | 115.9.1-1.el8_4 | RHSA-2024:1491 |
| RHEL 8.4 AUS | thunderbird | 115.9.0-1.el8_4 | RHSA-2024:1499 |
| RHEL 8.2 TUS | firefox | 115.9.1-1.el8_2 | RHSA-2024:1490 |
| RHEL 8.2 TUS | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
| RHEL 8.2 E4S | firefox | 115.9.1-1.el8_2 | RHSA-2024:1490 |
| RHEL 8.2 E4S | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
| RHEL 8.2 AUS | firefox | 115.9.1-1.el8_2 | RHSA-2024:1490 |
| RHEL 8.2 AUS | thunderbird | 115.9.0-1.el8_2 | RHSA-2024:1500 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | firefox +1 | 115.9.1-1.el9_3.alma.1 | ALSA-2024:1485 |
| AlmaLinux 9 | thunderbird | 115.9.0-1.el9_3.alma.1 | ALSA-2024:1493 |
| AlmaLinux 8 | firefox | 115.9.1-1.el8_9.alma.1 | ALSA-2024:1484 |
| AlmaLinux 8 | thunderbird | 115.9.0-1.el8_9.alma.1 | ALSA-2024:1494 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | firefox | 115.9.1-1.el8_9 | RLSA-2024:1484 |
| Rocky Linux 8 | thunderbird | 115.9.0-1.el8_9 | RLSA-2024:1494 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 15 SP5 | MozillaThunderbird | 115.9.0-150200.8.154.1 | SUSE-SU-2024:1147-1 |
| SLES 15 SP4 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 15 SP3 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 15 SP2 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES 12 SP5 | MozillaFirefox | 115.9.0-112.203.2 | SUSE-SU-2024:0971-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP4 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES for SAP 15 SP2 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 115.9.0-112.203.2 | SUSE-SU-2024:0971-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SLE HPC 15 SP2 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 124.0.1-1.1 | openSUSE-SU-2024:13795-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 115.9.0-1.1 | openSUSE-SU-2024:13789-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.5 | MozillaFirefox | 115.9.1-150200.152.131.1 | SUSE-SU-2024:1002-1 |
| openSUSE Leap 15.5 | MozillaThunderbird | 115.9.0-150200.8.154.1 | SUSE-SU-2024:1147-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox-esr | 115.9.0-r0 | — |
| Alpine v3.18 | firefox-esr | 115.9.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 115.9.0-1.amzn2.0.1 | ALAS2-2024-2505 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | firefox +1 | 115.9.1-1.0.1.el9_3 | ELSA-2024-1485 |
| Oracle Linux 9 | thunderbird | 115.9.0-1.0.1.el9_3 | ELSA-2024-1493 |
| Oracle Linux 8 | firefox | 115.9.1-1.0.1.el8_9 | ELSA-2024-1484 |
| Oracle Linux 8 | thunderbird | 115.9.0-1.0.1.el8_9 | ELSA-2024-1494 |
| Oracle Linux 7 | firefox | 115.9.1-1.0.1.el7_9 | ELSA-2024-1486 |
| Oracle Linux 7 | thunderbird | 115.9.0-1.0.1.el7_9 | ELSA-2024-1498 |
Advisories 45
- ALSA-2024:1485 Critical: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1493 Moderate: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1484 Critical: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2024:1494 Moderate: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:1496 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1500 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1499 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1492 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1495 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1494 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1497 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1498 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1493 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1491 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1489 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1490 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1488 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1487 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1485 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1486 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1484 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- RHSA-2024:1483 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jul 28, 2026
- USN-6717-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-6703-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DSA-5643-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5644-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3775-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3769-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2024:1484 Critical: firefox security update Rocky Linux Security Advisories · Feb 5, 2026
- RLSA-2024:1494 Moderate: thunderbird security update Rocky Linux Security Advisories · Feb 4, 2026
- SUSE-SU-2024:0971-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13795-1 MozillaFirefox-124.0.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13789-1 MozillaThunderbird-115.9.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:1002-1 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-2024:1147-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2024-0669 Mozilla Firefox, Firefox ESR und Thunderbird: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 15, 2024
- WID-SEC-2024-1248 Xerox FreeFlow Print Server: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 21, 2024
- ALAS2-2024-2505 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Mar 27, 2024
- ELSA-2024-1493 Moderate: thunderbird security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1485 Critical: firefox security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1494 Moderate: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1484 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1486 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 26, 2024
- ELSA-2024-1498 Moderate: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 25, 2024
References
- Memory safety bugs fixed in Firefox 124, Firefox ESR 115.9, and Thunderbird 115.9
- https://www.mozilla.org/security/advisories/mfsa2024-12/
- https://www.mozilla.org/security/advisories/mfsa2024-13/
- https://www.mozilla.org/security/advisories/mfsa2024-14/
- https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
- https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html