Description
Certain blit values provided by the user were not properly constrained leading to a heap buffer overflow on some video drivers. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 84 | 84 |
| Mozilla | Thunderbird | unspecified – < 78.6 | 78.6 |
| Mozilla | Firefox ESR | unspecified – < 78.6 | 78.6 |
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 | 78.6.0esr-1 | — |
| Debian 14 | thunderbird | 1:78.6.0-1 | — |
| Debian 13 | firefox-esr | 78.6.0esr-1 | — |
| Debian 13 | thunderbird | 1:78.6.0-1 | — |
| Debian 12 | firefox-esr | 78.6.0esr-1 | — |
| Debian 12 | thunderbird | 1:78.6.0-1 | — |
| Debian 10 | firefox-esr | 78.6.0esr-1~deb10u1 | DSA-4813-1 |
| Debian 10 | thunderbird | 1:78.6.0-1~deb10u1 | DSA-4815-1 |
| Debian 9 | firefox-esr | 78.6.0esr-1~deb9u1 | DLA-2496-1 |
| Debian 9 | thunderbird | 1:78.6.0-1~deb9u1 | DLA-2497-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | mozjs78 | No fix yet | — |
| Ubuntu 20.04 LTS | firefox | 84.0+build3-0ubuntu0.20.04.1 | USN-4671-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:78.7.1+build1-0ubuntu0.20.04.1 | — |
| Ubuntu 18.04 LTS | firefox | 84.0+build3-0ubuntu0.18.04.1 | USN-4671-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:78.8.1+build1-0ubuntu0.18.04.1 | — |
| Ubuntu 16.04 LTS | firefox | 84.0+build3-0ubuntu0.16.04.1 | USN-4671-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 78.6.0-1.el8_3 | RHSA-2020:5624, RHSA-2020:5562 |
| RHEL 7 | firefox +1 | 78.6.0-1.el7_9 | RHSA-2020:5618, RHSA-2020:5561 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.2 EUS | firefox +1 | 78.6.0-1.el8_2 | RHSA-2020:5622, RHSA-2020:5563 |
| RHEL 8.1 EUS | firefox +1 | 78.6.0-1.el8_1 | RHSA-2020:5644, RHSA-2020:5564 |
| RHEL 8.0 E4S | firefox +1 | 78.6.0-1.el8_0 | RHSA-2020:5645, RHSA-2020:5565 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | MozillaFirefox | 78.6.0-8.20.2 | SUSE-SU-2020:3901-1 |
| SLES 15 SP2 | MozillaThunderbird | 78.6.0-8.3.1 | SUSE-SU-2020:3935-1 |
| SLES 15 SP1 | MozillaFirefox | 78.6.0-3.122.1 | SUSE-SU-2020:3902-1 |
| SLES 15 SP1 | MozillaThunderbird | 78.6.0-3.113.1 | SUSE-SU-2020:3900-1 |
| SLES 12 SP5 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SLES 12 SP4 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SLES 12 SP3 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SLES 11 SP4 | MozillaFirefox | 78.6.0-78.108.1 | SUSE-SU-2020:14584-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE OpenStack Cloud Crowbar 9 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE OpenStack Cloud 9 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 78.6.0-112.39.1 | SUSE-SU-2020:3903-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 91.1.1-1.1 | openSUSE-SU-2024:10601-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.2 | MozillaFirefox | 78.6.0-lp152.2.34.1 | openSUSE-SU-2020:2318-1 |
| openSUSE Leap 15.2 | MozillaThunderbird | 78.6.0-lp152.2.23.1 | openSUSE-SU-2020:2317-1 |
| openSUSE Leap 15.1 | MozillaFirefox | 78.6.0-lp151.2.82.1 | openSUSE-SU-2020:2325-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 78.6.0-lp151.2.63.1 | openSUSE-SU-2020:2324-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | librewolf | 84.0.1-r0 | — |
| Alpine v3.23 | firefox +1 | 84.0.1-r0 | — |
| Alpine v3.23 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.23 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.22 | firefox +1 | 84.0.1-r0 | — |
| Alpine v3.22 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.22 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.21 | firefox +1 | 84.0.1-r0 | — |
| Alpine v3.21 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.21 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.20 | firefox | 84.0.1-r0 | — |
| Alpine v3.20 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.20 | thunderbird | 78.6.1-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | firefox | 84.0.1-r0 | — |
| Alpine v3.19 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.19 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.18 | firefox | 84.0.1-r0 | — |
| Alpine v3.18 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.18 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.17 | firefox | 84.0.1-r0 | — |
| Alpine v3.17 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.17 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.16 | firefox | 84.0.1-r0 | — |
| Alpine v3.16 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.16 | thunderbird | 78.6.1-r0 | — |
| Alpine v3.15 | firefox | 84.0.1-r0 | — |
| Alpine v3.15 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.14 | firefox | 84.0.1-r0 | — |
| Alpine v3.14 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.13 | firefox | 84.0.1-r0 | — |
| Alpine v3.13 | firefox-esr | 78.6.0-r0 | — |
| Alpine v3.12 | firefox | 84.0.1-r0 | — |
| Alpine v3.12 | firefox-esr | 78.6.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 78.6.0-1.amzn2 | ALAS2-2021-1586 |
Advisories 29
- RHSA-2020:5618 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2020:5561 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4671-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4813-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4815-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2497-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2496-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:14584-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2317-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2325-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10600-1 MozillaFirefox-92.0-1.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3935-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3903-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:2324-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3900-1 Security update for MozillaThunderbird 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-2020:3902-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2020:5645 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5644 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5624 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5622 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5565 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5564 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5563 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:5562 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- openSUSE-SU-2020:2318-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2020:3901-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2021-1586 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 6, 2021