Description
Memory safety bugs were reported in Firefox 57 and Firefox ESR 52.5. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. 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 20.04 LTS | mozjs52 | No fix yet | — |
| Ubuntu 18.04 LTS | firefox | 59.0.1+build1-0ubuntu1 | — |
| Ubuntu 18.04 LTS | mozjs38 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs52 | 52.8.1-0ubuntu0.18.04.1 | USN-3688-1 |
| 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 18
- 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-3688-1 mozjs52 vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 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
- USN-3688-1 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/buglist.cgi?bug_id=1412420%2C1426783%2C1422389%2C1415598%2C1410134%2C1408017%2C1224396%2C1382366%2C1415582%2C1417797%2C1409951%2C1414452%2C1428589%2C1425780%2C1399520%2C1418854%2C1408276%2C1412145%2C1331209%2C1425612