Description
A vulnerability where type-confusion in the IonMonkey just-in-time (JIT) compiler could potentially be used by malicious JavaScript to trigger a potentially exploitable crash. 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