Description
A use-after-free vulnerability can occur in HTTP/2 when a cached HTTP/2 stream is closed while still in use, resulting in a potentially exploitable crash. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox ESR | unspecified – < 60.8 | 60.8 |
| Mozilla | Firefox | unspecified – < 68 | 68 |
| Mozilla | Thunderbird | unspecified – < 60.8 | 60.8 |
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 | 60.8.0esr-1 | — |
| Debian 14 | thunderbird | 1:60.8.0-1 | — |
| Debian 13 | firefox-esr | 60.8.0esr-1 | — |
| Debian 13 | thunderbird | 1:60.8.0-1 | — |
| Debian 12 | firefox-esr | 60.8.0esr-1 | — |
| Debian 12 | thunderbird | 1:60.8.0-1 | — |
| Debian 10 | firefox-esr | 60.8.0esr-1~deb10u1 | DSA-4479-1 |
| Debian 10 | thunderbird | 1:60.8.0-1~deb10u1 | DSA-4482-1 |
| Debian 9 | firefox-esr | 60.8.0esr-1~deb9u1 | DSA-4479-1 |
| Debian 9 | thunderbird | 1:60.8.0-1~deb9u1 | DSA-4482-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | firefox-esr | 60.8.0esr-1~deb8u1 | DLA-1869-1 |
| Debian 8 | thunderbird | 1:60.8.0-1~deb8u1 | DLA-1870-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 68.0+build3-0ubuntu0.18.04.1 | USN-4054-1 |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | thunderbird | 1:60.8.0+build1-0ubuntu0.18.04.1 | USN-4064-1 |
| Ubuntu 16.04 LTS | firefox | 68.0+build3-0ubuntu0.16.04.1 | USN-4054-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:60.8.0+build1-0ubuntu0.16.04.2 | USN-4064-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | firefox +1 | 60.8.0-1.el8_0 | RHSA-2019:1799, RHSA-2019:1764 |
| RHEL 7 | firefox +1 | 60.8.0-1.el7_6 | RHSA-2019:1775, RHSA-2019:1763 |
| RHEL 6 | firefox +1 | 60.8.0-1.el6_10 | RHSA-2019:1777, RHSA-2019:1765 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | MozillaFirefox | 60.8.0-3.51.4 | SUSE-SU-2019:1869-1 |
| SLES 15 SP1 | MozillaThunderbird | 60.8.0-3.46.2 | SUSE-SU-2019:2515-1, SUSE-SU-2019:1960-1 |
| SLES 15 SP1 | mozilla-nss | 3.44.1-3.16.2 | SUSE-SU-2019:1869-1 |
| SLES 15 | MozillaFirefox | 60.8.0-3.51.4 | SUSE-SU-2019:1869-1 |
| SLES 15 | MozillaThunderbird | 60.8.0-3.46.2 | SUSE-SU-2019:2515-1, SUSE-SU-2019:1960-1 |
| SLES 15 | mozilla-nss | 3.44.1-3.16.2 | SUSE-SU-2019:1869-1 |
| SLES 12 SP5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP4 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES 12 SP4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP4 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SLES 12 SP3 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES 12 SP3 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP3 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES 12 SP2 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP2 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SLES 12 SP1 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES 12 SP1 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES 12 SP1 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SLES 11 SP4 | MozillaFirefox | 60.8.0esr-78.43.2 | SUSE-SU-2019:14246-1, SUSE-SU-2019:14124-1 |
| SLES 11 SP4 | MozillaFirefox-branding-SLED | 68-21.9.8 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-atk | 2.26.1-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-cairo | 1.15.10-2.13.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gdk-pixbuf | 2.36.11-2.8.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-glib2 | 2.54.3-2.14.7 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-gtk3 | 3.10.9-2.15.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-harfbuzz | 1.7.5-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi | 3.2.1.git259-2.3.3 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-libffi-gcc5 | 5.3.1+r233831-14.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | firefox-pango | 1.40.14-2.7.4 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nspr | 4.21-29.6.1 | SUSE-SU-2019:14246-1 |
| SLES 11 SP4 | mozilla-nss | 3.45-38.9.3 | SUSE-SU-2019:14246-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.1.0-109.89.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP4 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP3 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP2 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SLES for SAP 12 SP1 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 60.8.0-88.1 | openSUSE-SU-2019:1990-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-2 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud Crowbar 8 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-2 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 8 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE OpenStack Cloud 7 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-2 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE HPE Helion OpenStack 8 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-2 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-3, SUSE-SU-2019:1861-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 5 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-3, SUSE-SU-2019:1861-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox | 60.8.0-109.83.3 | SUSE-SU-2019:2620-1, SUSE-SU-2019:1861-1 |
| SUSE Enterprise Storage 4 | MozillaFirefox-branding-SLE | 68-32.8.1 | SUSE-SU-2019:2620-1 |
| SUSE Enterprise Storage 4 | mozilla-nss | 3.44.1-58.28.1 | SUSE-SU-2019:1861-1 |
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 +1 | 60.8.0-lp151.2.10.1 | openSUSE-SU-2019:2249-1, openSUSE-SU-2019:1813-1, openSUSE-SU-2019:1782-1 |
| openSUSE Leap 15.1 | enigmail | 2.1.2-lp151.2.6.1 | openSUSE-SU-2019:2249-1 |
| openSUSE Leap 15.1 | mozilla-nss | 3.44.1-lp151.2.3.1 | openSUSE-SU-2019:1782-1 |
| openSUSE Leap 15.0 | MozillaThunderbird | 60.8.0-lp151.2.10.1 | openSUSE-SU-2019:2248-1, openSUSE-SU-2019:1813-1 |
| openSUSE Leap 15.0 | enigmail | 2.1.2-lp150.34.1 | openSUSE-SU-2019:2248-1 |
| openSUSE Leap 15.0 | mozilla-nss | 3.44.1-lp150.2.24.1 | openSUSE-SU-2019:1811-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 68.0-r0 | — |
| Alpine v3.22 | firefox-esr | 68.0-r0 | — |
| Alpine v3.21 | firefox-esr | 68.0-r0 | — |
| Alpine v3.20 | firefox-esr | 68.0-r0 | — |
| Alpine v3.19 | firefox-esr | 68.0-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 68.0-r0 | — |
| Alpine v3.17 | firefox-esr | 68.0-r0 | — |
| Alpine v3.16 | firefox-esr | 68.0-r0 | — |
| Alpine v3.15 | firefox-esr | 68.0-r0 | — |
| Alpine v3.14 | firefox-esr | 68.0-r0 | — |
| Alpine v3.13 | firefox-esr | 68.0-r0 | — |
| Alpine v3.12 | firefox-esr | 68.0-r0 | — |
| Alpine v3.11 | firefox-esr | 68.0-r0 | — |
| Alpine v3.10 | firefox-esr | 60.8.0-r0 | — |
| Alpine v3.9 | firefox-esr | 60.8.0-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | thunderbird | 60.8.0-1.amzn2.0.1 | ALAS2-2019-1267 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | firefox | 60.8.0-1.0.2.el8_0 | ELSA-2019-1764 |
| Oracle Linux 8 | thunderbird | 60.8.0-1.0.1.el8_0 | ELSA-2019-1799 |
| Oracle Linux 7 | firefox +1 | 60.8.0-1.0.1.el7_6 | ELSA-2019-1775, ELSA-2019-1763 |
Advisories 36
- RHSA-2019:1775 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1777 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1763 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2019:1765 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-4064-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-4054-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4479-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4482-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1870-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1869-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2019:2249-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1990-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:2248-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1811-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14124-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1869-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2019:1782-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1861-2 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1960-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1861-1 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
- openSUSE-SU-2019:1813-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:1861-3 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2620-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:14246-1 Security update for Mozilla Firefox 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-2019:2515-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2019:1799 Red Hat Security Advisory: thunderbird security and bug fix update Red Hat Security Advisories (RHSA) · Jan 14, 2026
- RHSA-2019:1764 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jan 14, 2026
- WID-SEC-2023-0459 Mozilla Firefox/Firefox ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jun 2, 2025
- openSUSE-SU-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- ALAS2-2019-1267 Critical: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Aug 9, 2019
- ELSA-2019-1764 Critical: firefox security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ELSA-2019-1799 Important: thunderbird security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 30, 2019
- ELSA-2019-1775 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 15, 2019
- ELSA-2019-1763 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jul 11, 2019
References
- https://www.mozilla.org/security/advisories/mfsa2019-21/
- https://www.mozilla.org/security/advisories/mfsa2019-22/
- https://www.mozilla.org/security/advisories/mfsa2019-23/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1528481
- openSUSE-SU-2019:1811 vendor-advisory
- openSUSE-SU-2019:1813 vendor-advisory
- [debian-lts-announce] 20190802 [SECURITY] [DLA 1869-1] firefox-esr security update mailing-list
- [debian-lts-announce] 20190802 [SECURITY] [DLA 1870-1] thunderbird security update mailing-list
- GLSA-201908-12 vendor-advisory
- GLSA-201908-20 vendor-advisory
- openSUSE-SU-2019:1990 vendor-advisory
- openSUSE-SU-2019:2248 vendor-advisory
- openSUSE-SU-2019:2249 vendor-advisory