Description
Mozilla developers and community members reported memory safety bugs present in Firefox 65, Firefox ESR 60.5, and Thunderbird 60.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 60.6 | 60.6 |
| Mozilla | Firefox ESR | unspecified – < 60.6 | 60.6 |
| Mozilla | Firefox | unspecified – < 66 | 66 |
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 | 60.6.0esr-1 | — |
| Debian 14 | thunderbird | 1:60.6.1-1 | — |
| Debian 13 | firefox-esr | 60.6.0esr-1 | — |
| Debian 13 | thunderbird | 1:60.6.1-1 | — |
| Debian 12 | firefox-esr | 60.6.0esr-1 | — |
| Debian 12 | thunderbird | 1:60.6.1-1 | — |
| Debian 9 | firefox-esr | 60.6.0esr-1~deb9u1 | DSA-4411-1 |
| Debian 9 | thunderbird | 1:60.6.1-1~deb9u1 | DSA-4420-1 |
| Debian 8 | firefox-esr | 60.6.0esr-1~deb8u1 | DLA-1722-1 |
| Debian 8 | thunderbird | 1:60.6.1-1~deb8u1 | DLA-1743-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 66.0+build3-0ubuntu0.18.04.1 | USN-3918-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:60.6.1+build2-0ubuntu0.18.04.1 | USN-3927-1 |
| Ubuntu 16.04 LTS | firefox | 66.0+build3-0ubuntu0.16.04.2 | USN-3918-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.6.1+build2-0ubuntu0.16.04.1 | USN-3927-1 |
| Ubuntu 14.04 LTS | firefox | 66.0.1+build1-0ubuntu0.14.04.1 | USN-3918-2 |
| Ubuntu 14.04 LTS | thunderbird | 1:60.6.1+build2-0ubuntu0.14.04.1 | USN-3927-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 60.6.1-1.el8 | RHSA-2019:1144, RHSA-2019:0966 |
| RHEL 7 | firefox | 60.6.0-3.el7_6 | RHSA-2019:0622 |
| RHEL 7 | thunderbird | 60.6.1-1.el7_6 | RHSA-2019:0681 |
| RHEL 6 | firefox | 60.6.0-3.el6_10 | RHSA-2019:0623 |
| RHEL 6 | thunderbird | 60.6.1-1.el6_10 | RHSA-2019:0680 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 | MozillaFirefox | 60.6.1-3.29.3 | SUSE-SU-2019:0871-1 |
| SLES 15 | MozillaThunderbird | 60.6.1-3.28.1 | SUSE-SU-2019:0853-1 |
| SLES 12 SP4 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES 12 SP3 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES 12 SP2 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES 12 SP1 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 60.6.1-82.1 | openSUSE-SU-2019:1126-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.6.1esr-109.63.2 | SUSE-SU-2019:0852-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 92.0-1.2 | openSUSE-SU-2024:10600-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
| openSUSE Leap 15.0 | MozillaFirefox | 60.6.1-lp150.3.45.1 | openSUSE-SU-2019:1077-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 60.6.1-lp150.3.37.1 | openSUSE-SU-2019:1162-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.22 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.21 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.20 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.19 | firefox-esr | 60.6.1-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.17 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.16 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.15 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.14 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.13 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.12 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.11 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.10 | firefox-esr | 60.6.1-r0 | — |
| Alpine v3.9 | firefox-esr | 60.6.1-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 60.6.1-1.amzn2.0.1 | ALAS2-2019-1195 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 60.6.1-1.0.2.el8 | ELSA-2019-0966 |
| Oracle Linux 8 | thunderbird | 60.6.1-1.0.1.el8 | ELSA-2019-1144 |
| Oracle Linux 7 | firefox | 60.6.0-3.0.1.el7_6 | ELSA-2019-0622 |
| Oracle Linux 7 | thunderbird | 60.6.1-1.0.1.el7_6 | ELSA-2019-0681 |
Advisories 26
- RHSA-2019:1144 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0680 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0681 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2019:0966 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:0622 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2019:0623 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-3927-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3918-2 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3918-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4420-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4411-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1722-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1743-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:0853-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1162-1 Security update for MozillaThunderbird 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
- openSUSE-SU-2019:1126-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0871-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:0852-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1077-1 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
- ELSA-2019-0966 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ELSA-2019-1144 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ALAS2-2019-1195 Critical: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Apr 26, 2019
- ELSA-2019-0681 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 28, 2019
- ELSA-2019-0622 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Mar 20, 2019
References
- https://www.mozilla.org/security/advisories/mfsa2019-07/
- https://www.mozilla.org/security/advisories/mfsa2019-08/
- https://www.mozilla.org/security/advisories/mfsa2019-11/
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1518001%2C1521304%2C1521214%2C1506665%2C1516834%2C1518774%2C1524755%2C1523362%2C1524214%2C1529203
- RHSA-2019:0966 vendor-advisory
- RHSA-2019:1144 vendor-advisory