Description
A use-after-free vulnerability can occur in design mode when image objects are resized if objects referenced during the resizing have been freed from memory. This results in a potentially exploitable crash. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 56 | 56 |
| Mozilla | Firefox ESR | unspecified – < 52.4 | 52.4 |
| Mozilla | Thunderbird | unspecified – < 52.4 | 52.4 |
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 | 52.4.0esr-2 | — |
| Debian 14 | thunderbird | 1:52.4.0-1 | — |
| Debian 13 | firefox-esr | 52.4.0esr-2 | — |
| Debian 13 | thunderbird | 1:52.4.0-1 | — |
| Debian 12 | firefox-esr | 52.4.0esr-2 | — |
| Debian 12 | thunderbird | 1:52.4.0-1 | — |
| Debian 9 | firefox-esr | 52.4.0esr-1~deb9u1 | DSA-3987-1 |
| Debian 9 | thunderbird | 1:52.4.0-1~deb9u1 | DSA-4014-1 |
| Debian 8 | firefox-esr | 52.4.0esr-1~deb8u1 | DSA-3987-1 |
| Debian 8 | thunderbird | 1:52.4.0-1~deb8u1 | DSA-4014-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | firefox-esr | 52.4.0esr-2~deb7u1 | DLA-1118-1 |
| Debian 7 | thunderbird | 1:52.4.0-1~deb7u1 | DLA-1153-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | firefox | 56.0+build6-0ubuntu1 | — |
| Ubuntu 18.04 LTS | thunderbird | 1:52.4.0+build1-0ubuntu2 | — |
| Ubuntu 16.04 LTS | firefox | 56.0+build6-0ubuntu0.16.04.1 | USN-3435-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:52.4.0+build1-0ubuntu0.16.04.2 | USN-3436-1 |
| Ubuntu 14.04 LTS | firefox | 56.0+build6-0ubuntu0.14.04.1 | USN-3435-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.4.0+build1-0ubuntu0.14.04.2 | USN-3436-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox | 52.4.0-1.el7_4 | RHSA-2017:2831 |
| RHEL 7 | thunderbird | 52.4.0-2.el7_4 | RHSA-2017:2885 |
| RHEL 6 | firefox | 52.4.0-1.el6_9 | RHSA-2017:2831 |
| RHEL 6 | thunderbird | 52.4.0-2.el6_9 | RHSA-2017:2885 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES 12 SP3 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES 12 SP2 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES 12 SP2 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES 12 SP1 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES 12 SP1 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES 12 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES 12 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES 11 SP4 | MozillaFirefox | 52.4.0esr-72.13.2 | SUSE-SU-2017:2872-2, SUSE-SU-2017:2872-1 |
| SLES 11 SP4 | mozilla-nss | 3.29.5-47.6.1 | SUSE-SU-2017:2872-2, SUSE-SU-2017:2872-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | MozillaFirefox | 52.4.0esr-72.13.2 | SUSE-SU-2017:2872-2, SUSE-SU-2017:2872-1 |
| SLES 11 SP3 | mozilla-nss | 3.29.5-47.6.1 | SUSE-SU-2017:2872-2, SUSE-SU-2017:2872-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES for SAP 12 SP3 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES for SAP 12 SP2 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SLES for SAP 12 SP1 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 52.4.0esr-72.13.2 | SUSE-SU-2017:2872-2, SUSE-SU-2017:2872-1 |
| SLES for SAP 11 SP4 | mozilla-nss | 3.29.5-47.6.1 | SUSE-SU-2017:2872-2, SUSE-SU-2017:2872-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 52.4.0-45.1 | openSUSE-SU-2017:2710-1, openSUSE-SU-2017:2707-1 |
| SUSE OpenStack Cloud 6 | MozillaFirefox | 52.4.0esr-109.6.2 | SUSE-SU-2017:2688-1 |
| SUSE OpenStack Cloud 6 | mozilla-nss | 3.29.5-58.3.1 | SUSE-SU-2017:2688-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 52.4.0esr-72.13.2 | SUSE-SU-2017:2872-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | mozilla-nss | 3.29.5-47.6.1 | SUSE-SU-2017:2872-1 |
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 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox | 52.4.0-1.0.1.el7_4 | ELSA-2017-2831 |
| Oracle Linux 7 | thunderbird | 52.4.0-2.0.1.el7_4 | ELSA-2017-2885 |
Advisories 18
- RHSA-2017:2885 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2017:2831 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-3436-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3435-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4014-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3987-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1118-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1153-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2017:2872-1 Security update for MozillaFirefox, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2872-2 Security update for MozillaFirefox, mozilla-nss SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2017:2710-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2688-1 Security update for MozillaFirefox, 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
- openSUSE-SU-2024:14572-1 firefox-esr-128.5.1-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2017:2707-1 Security update for MozillaThunderbird 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
- ELSA-2017-2885 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 12, 2017
- ELSA-2017-2831 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 29, 2017
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1380292
- [debian-lts-announce] 20171101 [SECURITY] [DLA 1153-1] icedove/thunderbird security update mailing-list
- https://www.mozilla.org/security/advisories/mfsa2017-22/
- 1039465 vdb-entry
- RHSA-2017:2831 vendor-advisory
- RHSA-2017:2885 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2017-21/
- 101055 vdb-entry
- DSA-4014 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2017-23/
- DSA-3987 vendor-advisory
- GLSA-201803-14 vendor-advisory