Description
An integer overflow vulnerability in the Skia library when allocating memory for edge builders on some systems with at least 8 GB of RAM. This results in the use of uninitialized memory, resulting in a potentially exploitable crash. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Thunderbird | unspecified – < 52.6 | 52.6 |
| Mozilla | Firefox ESR | unspecified – < 52.6 | 52.6 |
| Mozilla | Firefox | unspecified – < 58 | 58 |
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 | 52.6.0esr-1 | — |
| Debian 14 | thunderbird | 1:52.6.0-1 | — |
| Debian 13 | firefox-esr | 52.6.0esr-1 | — |
| Debian 13 | thunderbird | 1:52.6.0-1 | — |
| Debian 12 | firefox-esr | 52.6.0esr-1 | — |
| Debian 12 | thunderbird | 1:52.6.0-1 | — |
| Debian 9 | firefox-esr | 52.6.0esr-1~deb9u1 | DSA-4096-1 |
| Debian 9 | thunderbird | 1:52.6.0-1~deb9u1 | DSA-4102-1 |
| Debian 8 | firefox-esr | 52.6.0esr-1~deb8u1 | DSA-4096-1 |
| Debian 8 | thunderbird | 1:52.6.0-1~deb8u1 | DSA-4102-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | firefox-esr | 52.6.0esr-1~deb7u1 | DLA-1256-1 |
| Debian 7 | thunderbird | 1:52.6.0-1~deb7u1 | DLA-1262-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | firefox | 59.0.1+build1-0ubuntu1 | — |
| Ubuntu 18.04 LTS | thunderbird | 1:52.6.0+build1-0ubuntu1 | — |
| Ubuntu 16.04 LTS | firefox | 58.0+build6-0ubuntu0.16.04.1 | USN-3544-1 |
| Ubuntu 16.04 LTS | thunderbird | 1:52.6.0+build1-0ubuntu0.16.04.1 | USN-3529-1 |
| Ubuntu 14.04 LTS | firefox | 58.0+build6-0ubuntu0.14.04.1 | USN-3544-1 |
| Ubuntu 14.04 LTS | thunderbird | 1:52.6.0+build1-0ubuntu0.14.04.1 | USN-3529-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | firefox +1 | 52.6.0-1.el7_4 | RHSA-2018:0262, RHSA-2018:0122 |
| RHEL 6 | firefox +1 | 52.6.0-1.el6_9 | RHSA-2018:0262, RHSA-2018:0122 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES 12 SP2 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES 12 SP1 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES 12 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES 11 SP4 | MozillaFirefox | 52.6.0esr-72.20.2 | SUSE-SU-2018:0361-1 |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP3 | MozillaFirefox | 52.6.0esr-72.20.2 | SUSE-SU-2018:0361-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SLES for SAP 11 SP4 | MozillaFirefox | 52.6.0esr-72.20.2 | SUSE-SU-2018:0361-1 |
| SUSE Package Hub 12 | MozillaThunderbird | 52.6-54.1 | openSUSE-SU-2018:0257-1, openSUSE-SU-2018:0256-1 |
| SUSE OpenStack Cloud 6 | MozillaFirefox | 52.6.0esr-109.13.1 | SUSE-SU-2018:0374-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | MozillaFirefox | 52.6.0esr-72.20.2 | SUSE-SU-2018:0361-1 |
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 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.23 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.22 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.21 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.20 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.19 | firefox-esr | 52.6.0-r0 | — |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.18 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.17 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.16 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.15 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.14 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.13 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.12 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.11 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.10 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.9 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.8 | firefox-esr | 52.6.0-r0 | — |
| Alpine v3.7 | firefox-esr | 52.6.0-r0 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | firefox +1 | 52.6.0-1.0.1.el7_4 | ELSA-2018-0262, ELSA-2018-0122 |
Advisories 17
- RHSA-2018:0262 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2018:0122 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- USN-3544-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3529-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4096-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4102-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1256-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1262-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2018:0374-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2018:0256-1 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
- SUSE-SU-2018:0361-1 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-2024:10601-1 MozillaThunderbird-91.1.1-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- openSUSE-SU-2018:0257-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2018-0262 Important: thunderbird security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 1, 2018
- ELSA-2018-0122 Critical: firefox security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Jan 24, 2018
References
- https://www.mozilla.org/security/advisories/mfsa2018-03/
- 1040270 vdb-entry
- [debian-lts-announce] 20180129 [SECURITY] [DLA 1262-1] thunderbird security update mailing-list
- 102783 vdb-entry
- DSA-4096 vendor-advisory
- RHSA-2018:0262 vendor-advisory
- USN-3544-1 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-04/
- RHSA-2018:0122 vendor-advisory
- https://www.mozilla.org/security/advisories/mfsa2018-02/
- [debian-lts-announce] 20180124 [SECURITY] [DLA 1256-1] firefox-esr security update mailing-list
- DSA-4102 vendor-advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1418447