Description
A use-after-free vulnerability can occur when flushing and resizing layout because the "PressShell" object has been freed while still in use. This results in a potentially exploitable crash during these operations. This vulnerability affects Firefox < 57, Firefox ESR < 52.5, and Thunderbird < 52.5.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 57 | 57 |
| Mozilla | Firefox ESR | unspecified – < 52.5 | 52.5 |
| Mozilla | Thunderbird | unspecified – < 52.5 | 52.5 |
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 | 52.5.0esr-1 | — |
| Debian 14 | thunderbird | 1:52.5.0-1 | — |
| Debian 13 | firefox-esr | 52.5.0esr-1 | — |
| Debian 13 | thunderbird | 1:52.5.0-1 | — |
| Debian 12 | firefox-esr | 52.5.0esr-1 | — |
| Debian 12 | thunderbird | 1:52.5.0-1 | — |
| Debian 9 | firefox-esr | 52.5.0esr-1~deb9u1 | DSA-4035-1 |
| Debian 9 | thunderbird | 1:52.5.0-1~deb9u1 | DSA-4075-1, DSA-4061-1 |
| Debian 8 | firefox-esr | 52.5.0esr-1~deb8u1 | DSA-4035-1 |
| Debian 8 | thunderbird | 1:52.5.0-1~deb8u1 | DSA-4075-1, DSA-4061-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | firefox-esr | 52.5.0esr-1~deb7u1 | DLA-1172-1 |
| Debian 7 | thunderbird | 1:52.5.0-1~deb7u1 | DLA-1199-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | firefox | 57.0.1+build2-0ubuntu1 | — |
| Ubuntu 18.04 LTS | thunderbird | 1:52.6.0+build1-0ubuntu1 | — |
| Ubuntu 16.04 LTS | firefox | 57.0+build4-0ubuntu0.16.04.5 | USN-3477-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:52.5.0+build1-0ubuntu0.16.04.1 | USN-3490-1 |
| Ubuntu 14.04 LTS | firefox | 57.0+build4-0ubuntu0.14.04.4 | USN-3477-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.5.0+build1-0ubuntu0.14.04.1 | USN-3490-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox +1 | 52.5.0-1.el7_4 | RHSA-2017:3372, RHSA-2017:3247 |
| RHEL 6 | firefox +1 | 52.5.0-1.el6_9 | RHSA-2017:3372, RHSA-2017:3247 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES 12 SP2 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES 12 SP1 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES 12 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES 11 SP4 | MozillaFirefox | 52.5.0esr-72.17.1 | SUSE-SU-2017:3233-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | MozillaFirefox | 52.5.0esr-72.17.1 | SUSE-SU-2017:3233-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 52.5.0esr-72.17.1 | SUSE-SU-2017:3233-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 52.5.0-48.1 | openSUSE-SU-2017:3110-1, openSUSE-SU-2017:3108-1 |
| SUSE OpenStack Cloud 6 | MozillaFirefox | 52.5.0esr-109.9.1 | SUSE-SU-2017:3213-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 52.5.0esr-72.17.1 | SUSE-SU-2017:3233-1 |
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 |
Advisories 16
- RHSA-2017:3372 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2017:3247 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3477-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3490-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4061-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4075-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4035-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1172-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1199-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2017:3108-1 Security update for Mozilla Thunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:3233-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:3213-1 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-2017:3110-1 Security update for Mozilla Thunderbird 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-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
References
- [debian-lts-announce] 20171209 [SECURITY] [DLA 1199-1] thunderbird security update mailing-list
- https://bugzilla.mozilla.org/show_bug.cgi?id=1406750
- DSA-4035 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1412252
- https://www.mozilla.org/security/advisories/mfsa2017-24/
- https://www.mozilla.org/security/advisories/mfsa2017-25/
- 101832 vdb-entry
- https://www.mozilla.org/security/advisories/mfsa2017-26/
- 1039803 vdb-entry
- DSA-4061 vendor-advisory
- [debian-lts-announce] 20171115 [SECURITY] [DLA 1172-1] firefox-esr security update mailing-list
- RHSA-2017:3247 vendor-advisory
- DSA-4075 vendor-advisory
- RHSA-2017:3372 vendor-advisory