Description
A vulnerability was identified in Thunderbird where XPath parsing could trigger undefined behavior due to missing null checks during attribute access. This could lead to out-of-bounds read access and potentially, memory corruption. This vulnerability was fixed in Firefox 138, Firefox ESR 128.10, Thunderbird 138, and Thunderbird 128.10.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Mozilla | Firefox | — | 128.10 |
| Mozilla | Thunderbird | — | 128.10 |
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 | 128.10.0esr-1 | — |
| Debian 14 | thunderbird | 1:128.10.0esr-1 | — |
| Debian 13 | firefox-esr | 128.10.0esr-1 | — |
| Debian 13 | thunderbird | 1:128.10.0esr-1 | — |
| Debian 12 | firefox-esr | 128.10.0esr-1~deb12u1 | DSA-5910-1 |
| Debian 12 | thunderbird | 1:128.10.0esr-1~deb12u1 | DSA-5912-1 |
| Debian 11 | firefox-esr | 128.10.1esr-1~deb11u1 | DLA-4172-1 |
| Debian 11 | thunderbird | 1:128.10.1esr-1~deb11u1 | DLA-4167-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | mozjs102 +1 | No fix yet | — |
| Ubuntu 22.04 LTS | mozjs78 +2 | No fix yet | — |
| Ubuntu 22.04 LTS | thunderbird | 1:128.12.0+build1-0ubuntu0.22.04.1 | USN-7663-1 |
| Ubuntu 20.04 LTS | mozjs52 +1 | No fix yet | — |
| Ubuntu 18.04 LTS | mozjs38 +1 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | firefox +1 | 128.10.0-1.el10_0 | RHSA-2025:7507, RHSA-2025:7506 |
| RHEL 9 | firefox +2 | 128.10.0-1.el9_5 | RHSA-2025:7428, RHSA-2025:4460, RHSA-2025:4443 |
| RHEL 8 | firefox +1 | 128.10.0-1.el8_10 | RHSA-2025:4797, RHSA-2025:4458 |
Show 12 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | firefox +2 | 128.10.0-1.el9_4 | RHSA-2025:7695, RHSA-2025:4756 |
| RHEL 9.2 EUS | firefox +2 | 128.10.0-1.el9_2 | RHSA-2025:7694, RHSA-2025:4752 |
| RHEL 9.0 E4S | firefox +1 | 128.10.0-1.el9_0 | RHSA-2025:7692, RHSA-2025:4753 |
| RHEL 8.8 EUS | firefox +1 | 128.10.0-1.el8_8 | RHSA-2025:7689, RHSA-2025:7543 |
| RHEL 8.6 TUS | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.6 E4S | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.6 AUS | firefox +1 | 128.10.0-1.el8_6 | RHSA-2025:7690, RHSA-2025:7544 |
| RHEL 8.4 TUS | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.4 E4S | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.4 AUS | firefox +1 | 128.10.0-1.el8_4 | RHSA-2025:7691, RHSA-2025:7545 |
| RHEL 8.2 AUS | firefox +1 | 128.10.0-1.el8_2 | RHSA-2025:7693, RHSA-2025:7547 |
| RHEL 7 ELS | firefox | 128.10.0-1.el7_9 | RHSA-2025:4751 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | firefox | 128.10.0-1.el10_0 | ALSA-2025:7506 |
| AlmaLinux 10 | thunderbird | 128.10.0-1.el10_0.alma.1 | ALSA-2025:7507 |
| AlmaLinux 9 | firefox +2 | 128.10.0-1.el9_5.alma.1 | ALSA-2025:7428, ALSA-2025:4460, ALSA-2025:4443 |
| AlmaLinux 8 | firefox +1 | 128.10.0-1.el8_10.alma.1 | ALSA-2025:4797, ALSA-2025:4458 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | firefox +1 | 128.10.0-1.el9_5 | RLSA-2025:7428, RLSA-2025:4460, RLSA-2025:4443 |
| Rocky Linux 8 | firefox +1 | 128.10.0-1.el8_10 | RLSA-2025:4797, RLSA-2025:4458 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP6 | MozillaThunderbird | 128.10.0-150200.8.212.1 | SUSE-SU-2025:1506-1 |
| SLES 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES for SAP 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLES for SAP 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP5 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP4 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SLE HPC 15 SP3 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| SUSE Enterprise Storage 7.1 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | MozillaFirefox | 138.0-1.1 | openSUSE-SU-2025:15045-1 |
| openSUSE Tumbleweed | MozillaThunderbird | 128.10.0-1.1 | openSUSE-SU-2025:15042-1 |
| openSUSE Tumbleweed | firefox-esr | 153.0-1.1 | openSUSE-SU-2026:11373-1 |
| openSUSE Leap 15.6 | MozillaFirefox | 128.10.0-150200.152.179.1 | SUSE-SU-2025:1436-1 |
| openSUSE Leap 15.6 | MozillaThunderbird | 128.10.0-150200.8.212.1 | SUSE-SU-2025:1506-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | firefox | 128.10.0-1.amzn2023.0.2 | ALAS2023-2025-976 |
| Amazon Linux 2 | thunderbird | 128.10.0-1.amzn2.0.1 | ALAS2-2025-2858 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | firefox +1 | 128.11.0-1.0.1.el10_0 | ELSA-2025-7507, ELSA-2025-7506 |
| Oracle Linux 9 | firefox +2 | 128.10.0-1.0.1.el9_5 | ELSA-2025-7428, ELSA-2025-4460, ELSA-2025-4443 |
| Oracle Linux 8 | firefox +1 | 128.10.0-1.0.1.el8_10 | ELSA-2025-4797, ELSA-2025-4458 |
| Oracle Linux 7 | firefox | 128.10.0-1.0.1.el7_9 | ELSA-2025-4751 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | firefox | 128.10-r0 | — |
Advisories 50
- ALSA-2025:7506 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7507 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7428 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4460 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4443 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4797 Important: thunderbird security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:4458 Important: firefox security update AlmaLinux Security Advisories · Oct 29, 2026
- openSUSE-SU-2026:11373-1 firefox-esr-153.0-1.1 on GA media SUSE / openSUSE Security Updates · Jul 26, 2026
- RHSA-2025:7693 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:4458 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2025:7694 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7695 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7692 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7691 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7689 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7690 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7545 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7547 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7544 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7543 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7506 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7507 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:7428 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4797 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4756 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4752 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4753 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4751 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4460 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- RHSA-2025:4443 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- USN-7663-1 thunderbird vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2025:15042-1 MozillaThunderbird-128.10.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- openSUSE-SU-2025:15045-1 MozillaFirefox-138.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5912-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-5910-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4172-1 firefox-esr - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4167-1 thunderbird - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:1436-1 Security update for MozillaFirefox SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1506-1 Security update for MozillaThunderbird SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1850 Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Nov 17, 2025
- ALAS2-2025-2858 Important: thunderbird security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 29, 2025
- ALAS2023-2025-976 Important: firefox security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 29, 2025
- WID-SEC-2025-0901 Mozilla Firefox, Firefox ESR, Thunderbird and Thunderbird ESR: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 29, 2025
- RLSA-2025:4443 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4460 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:7428 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4797 Important: thunderbird security update Rocky Linux Security Advisories · Jul 29, 2025
- RLSA-2025:4458 Important: firefox security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-7507 Important: thunderbird security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025
- ELSA-2025-7506 Important: firefox security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 30, 2025