Description
An integer overflow during the parsing of XML using the Expat library. This vulnerability affects Firefox < 50.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | unspecified – < 50 | 50 |
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 | expat | 2.2.0-2 | — |
| Debian 13 | expat | 2.2.0-2 | — |
| Debian 12 | expat | 2.2.0-2 | — |
| Debian 12 | libxmltok | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | firefox | 50.0+build2-0ubuntu0.16.04.2 | USN-3124-1 |
| Ubuntu 14.04 LTS | firefox | 50.0+build2-0ubuntu0.14.04.2 | USN-3124-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES 12 SP5 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP5 | expat | 2.8.5-21.55.1 | SUSE-SU-2026:4615-1 |
| SLES 12 SP5 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP5 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP4 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP4 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP4 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
Show 26 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP3 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES 12 SP3 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP3 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP2 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP2 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES 12 SP2 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP2 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 SP1 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES 12 SP1 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 SP1 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 12 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES 12 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES 11 SP4 | expat | 2.0.1-88.42.3.2 | SUSE-SU-2017:2375-1 |
| SUSE Studio Onsite 1.3 | expat | 2.0.1-88.42.3.2 | SUSE-SU-2017:2375-1 |
| SLES for SAP 15 SP6 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLES for SAP 12 SP5 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP5 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP5 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP4 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP4 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP4 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP3 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP3 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES for SAP 12 SP3 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP3 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP2 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP2 | expat | 2.1.0-21.3.1 | SUSE-SU-2017:2299-1 |
| SLES for SAP 12 SP2 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP2 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP1 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SLES for SAP 12 SP1 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SLES for SAP 12 SP1 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SLES for SAP 11 SP4 | expat | 2.0.1-88.42.3.2 | SUSE-SU-2017:2375-1 |
| SLE Micro 6.0 | expat | 2.8.5-159998.1.1 | SUSE-SU-2026:24323-1 |
| SLE Micro 5.5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE Micro 5.4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE Micro 5.3 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE HPC 15 SP5 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SLE HPC 15 SP4 | expat | 2.8.5-150400.3.40.1 | SUSE-SU-2026:4623-1 |
| SUSE OpenStack Cloud Crowbar 8 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE OpenStack Cloud Crowbar 8 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud Crowbar 8 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 8 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE OpenStack Cloud 8 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 8 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 7 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE OpenStack Cloud 7 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE OpenStack Cloud 7 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE HPE Helion OpenStack 8 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE HPE Helion OpenStack 8 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE HPE Helion OpenStack 8 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
| SUSE Enterprise Storage 5 | MozillaFirefox | 68.2.0-109.95.2 | SUSE-SU-2019:2872-1 |
| SUSE Enterprise Storage 5 | python3 | 3.4.10-25.39.3 | SUSE-SU-2020:0497-1 |
| SUSE Enterprise Storage 5 | python3-base | 3.4.10-25.39.2 | SUSE-SU-2020:0497-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 50.1.0-1.1 | openSUSE-SU-2024:10071-1 |
| openSUSE Tumbleweed | expat | 2.4.1-1.2 | openSUSE-SU-2024:10748-1 |
| openSUSE Tumbleweed | firefox-esr | 128.5.1-1.1 | openSUSE-SU-2024:14572-1 |
Advisories 12
- SUSE-SU-2026:24323-1 Security update for expat SUSE / openSUSE Security Updates · Oct 27, 2026
- SUSE-SU-2026:4623-1 Security update for expat SUSE / openSUSE Security Updates · Oct 13, 2026
- SUSE-SU-2026:4615-1 Security update for expat SUSE / openSUSE Security Updates · Oct 13, 2026
- USN-3124-1 firefox vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- SUSE-SU-2017:2299-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2019:2872-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2375-1 Security update for expat SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10748-1 expat-2.4.1-1.2 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
- SUSE-SU-2020:0497-1 Security update for python3 SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10071-1 MozillaFirefox-50.1.0-1.1 on GA media SUSE / openSUSE Security Updates · May 7, 2025
- WID-SEC-2025-0370 Apple Mac OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 13, 2025
References
- DSA-3898 vendor-advisory
- 94337 vdb-entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1274777
- 1037298 vdb-entry
- 1039427 vdb-entry
- https://www.mozilla.org/security/advisories/mfsa2016-89/