Description
When using nested workers, a use-after-free could occur during worker destruction. This resulted in a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | before 68.3 | — |
| Mozilla | Firefox ESR | before 68.3 | — |
| Mozilla | Firefox | before 71 | — |
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 | 68.3.0esr-1 | — |
| Debian 14 | thunderbird | 1:68.3.0-1 | — |
| Debian 13 | firefox-esr | 68.3.0esr-1 | — |
| Debian 13 | thunderbird | 1:68.3.0-1 | — |
| Debian 12 | firefox-esr | 68.3.0esr-1 | — |
| Debian 12 | thunderbird | 1:68.3.0-1 | — |
| Debian 10 | firefox-esr | 68.3.0esr-1~deb10u1 | DSA-4580-1 |
| Debian 10 | thunderbird | 1:68.3.0-2~deb10u1 | DSA-4585-1 |
| Debian 9 | firefox-esr | 68.3.0esr-1~deb9u1 | DSA-4580-1 |
| Debian 9 | thunderbird | 1:68.3.0-2~deb9u1 | DSA-4585-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | firefox-esr | 68.3.0esr-1~deb8u1 | DLA-2029-1 |
| Debian 8 | thunderbird | 1:68.3.0-2~deb8u1 | DLA-2036-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | firefox | 71.0+build5-0ubuntu1 | — |
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 20.04 LTS | thunderbird | 1:68.3.0+build2-0ubuntu1 | — |
| Ubuntu 18.04 LTS | firefox | 71.0+build5-0ubuntu0.18.04.1 | USN-4216-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:68.4.1+build1-0ubuntu0.18.04.1 | USN-4241-1 |
| Ubuntu 16.04 LTS | firefox | 71.0+build5-0ubuntu0.16.04.1 | USN-4216-2 |
| Ubuntu 16.04 LTS | thunderbird | 1:68.7.0+build1-0ubuntu0.16.04.2 | USN-4335-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox | 68.3.0-1.el8_1 | RHSA-2019:4111 |
| RHEL 8 | thunderbird | 68.3.0-2.el8_1 | RHSA-2019:4195 |
| RHEL 7 | firefox +1 | 68.3.0-1.el7_7 | RHSA-2019:4148, RHSA-2019:4107 |
| RHEL 6 | firefox | 68.3.0-1.el6_10 | RHSA-2019:4108 |
| RHEL 6 | thunderbird | 68.3.0-3.el6_10 | RHSA-2019:4205 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8.0 E4S | firefox | 68.4.1-1.el8_0 | RHSA-2020:0295 |
| RHEL 8.0 E4S | thunderbird | 68.4.1-2.el8_0 | RHSA-2020:0292 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 68.3.0-3.62.2 | SUSE-SU-2019:3337-1 |
| SLES 15 SP1 | MozillaThunderbird | 68.3.0-3.61.2 | SUSE-SU-2019:3339-1 |
| SLES 15 | MozillaFirefox | 68.3.0-3.62.2 | SUSE-SU-2019:3337-1 |
| SLES 15 | MozillaThunderbird | 68.3.0-3.61.2 | SUSE-SU-2019:3339-1 |
| SLES 12 SP5 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP4 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP3 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
Show 13 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 12 SP1 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES 11 SP4 | MozillaFirefox | 68.3.0-78.54.1 | SUSE-SU-2019:14260-1 |
| SLES 11 SP4 | mozilla-nspr | 4.23-29.9.1 | SUSE-SU-2019:14260-1 |
| SLES 11 SP4 | mozilla-nss | 3.47.1-38.12.1 | SUSE-SU-2019:14260-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.3.0-109.98.1 | SUSE-SU-2019:3347-1 |
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 15.1 | MozillaFirefox | 68.3.0-lp151.2.21.1 | openSUSE-SU-2020:0002-1 |
| openSUSE Leap 15.1 | MozillaThunderbird | 68.3.0-lp151.2.19.1 | openSUSE-SU-2020:0003-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.22 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.21 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.20 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.19 | firefox-esr | 68.3.0-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.17 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.16 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.15 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.14 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.13 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.12 | firefox-esr | 68.3.0-r0 | — |
| Alpine v3.11 | firefox-esr | 68.3.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 68.3.0-1.amzn2.0.1 | ALAS2-2020-1386 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 68.3.0-1.0.1.el8_1 | ELSA-2019-4111 |
| Oracle Linux 8 | thunderbird | 68.3.0-2.0.1.el8_1 | ELSA-2019-4195 |
| Oracle Linux 7 | firefox +1 | 68.3.0-1.0.1.el7_7 | ELSA-2019-4148, ELSA-2019-4107 |
Advisories 31
- RHSA-2019:4205 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:4148 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:4108 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:4107 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4335-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- USN-4241-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4216-2 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4216-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4585-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4580-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2036-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2029-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2019:3337-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0002-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14260-1 Security update for MozillaFirefox, mozilla-nspr, mozilla-nss 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-2019:3339-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:3347-1 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
- openSUSE-SU-2020:0003-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2020:0295 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2020:0292 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2019:4195 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2019:4111 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2022-1826 Mozilla Firefox: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 19, 2024
- ALAS2-2020-1386 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jan 17, 2020
- ELSA-2019-4195 Important: thunderbird security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 11, 2019
- ELSA-2019-4148 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 11, 2019
- ELSA-2019-4107 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 6, 2019
- ELSA-2019-4111 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Dec 5, 2019
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1546331
- https://www.mozilla.org/security/advisories/mfsa2019-36/
- https://www.mozilla.org/security/advisories/mfsa2019-38/
- https://www.mozilla.org/security/advisories/mfsa2019-37/
- openSUSE-SU-2020:0003 vendor-advisory
- openSUSE-SU-2020:0002 vendor-advisory
- USN-4241-1 vendor-advisory
- RHSA-2020:0292 vendor-advisory
- RHSA-2020:0295 vendor-advisory
- GLSA-202003-02 vendor-advisory
- GLSA-202003-10 vendor-advisory
- USN-4335-1 vendor-advisory