critical
CVE-2026-84143
firefox: Internally found bugs fixed in Firefox 155, Firefox ESR 153.2 and Firefox ESR 140.15
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.
Severity by source
NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Red Hat7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Red Hat (high), AlmaLinux (high), Amazon (high), Oracle (high), Rocky Linux (high), Ubuntu (medium).
Description
Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of these bugs showed evidence of memory corruption or another security-relevant defect and we presume that with enough effort some of these could have been exploited. This vulnerability was fixed in Firefox 155, Firefox ESR 140.15, Firefox ESR 153.2, Thunderbird 155, Thunderbird 140.15, and Thunderbird 153.2.
Affected packages and fixed versions
| Source | Package | Fixed in |
|---|---|---|
| alma 10 | firefox, thunderbird | 140.15.0-1.el10_2 and 1 more |
| alma 8 | firefox, thunderbird | 140.15.0-1.el8_10.alma.1 and 1 more |
| alma 9 | firefox, firefox-x11, thunderbird | 140.15.0-1.el9_8.alma.1 and 1 more |
| amazon linux 2023 | firefox, firefox-debuginfo, firefox-debugsource | 140.16.0-1.amzn2023.0.1 |
| chainguard | firefox | 155.0.1-r0 |
| debian 11 | firefox-esr, thunderbird | no fix listed |
| debian 12 | firefox-esr, thunderbird | 140.15.0esr-1~deb12u1 and 1 more |
| debian 13 | firefox-esr, thunderbird | 140.15.0esr-1~deb13u1 and 1 more |
| debian 14 | firefox-esr, thunderbird | 140.15.0esr-1 and 1 more |
| echo | firefox-esr, thunderbird | 140.15.0esr-1~deb12u1 and 1 more |
| Oracle Linux 8 | firefox, thunderbird | 140.15.0-1.0.1.el8_10 and 1 more |
| Oracle Linux 9 | firefox, firefox-x11, thunderbird | 140.15.0-1.0.1.el9_8 and 1 more |
Show all 70 entries from 35 sources
| Source | Package | Fixed in |
|---|---|---|
| alma 10 | firefox | 140.15.0-1.el10_2 |
| alma 10 | thunderbird | 140.16.0-1.el10_2.alma.1 |
| alma 8 | firefox | 140.15.0-1.el8_10.alma.1 |
| alma 8 | thunderbird | 140.16.0-1.el8_10.alma.1 |
| alma 9 | firefox | 140.15.0-1.el9_8.alma.1 |
| alma 9 | firefox-x11 | 140.15.0-1.el9_8.alma.1 |
| alma 9 | thunderbird | 140.16.0-1.el9_8.alma.1 |
| amazon linux 2023 | firefox | 140.16.0-1.amzn2023.0.1 |
| amazon linux 2023 | firefox-debuginfo | 140.16.0-1.amzn2023.0.1 |
| amazon linux 2023 | firefox-debugsource | 140.16.0-1.amzn2023.0.1 |
| chainguard | firefox | 155.0.1-r0 |
| debian 11 | firefox-esr | no fix listed |
| debian 11 | thunderbird | no fix listed |
| debian 12 | firefox-esr | 140.15.0esr-1~deb12u1 |
| debian 12 | thunderbird | 1:140.15.0esr-1~deb12u1 |
| debian 13 | firefox-esr | 140.15.0esr-1~deb13u1 |
| debian 13 | thunderbird | 1:140.15.0esr-1~deb13u1 |
| debian 14 | firefox-esr | 140.15.0esr-1 |
| debian 14 | thunderbird | 1:153.2.0esr-1 |
| echo | firefox-esr | 140.15.0esr-1~deb12u1 |
| echo | thunderbird | 1:140.15.0esr-1~deb12u1 |
| Oracle Linux 8 | firefox | 140.15.0-1.0.1.el8_10 |
| Oracle Linux 8 | thunderbird | 140.16.0-1.0.1.el8_10 |
| Oracle Linux 9 | firefox | 140.15.0-1.0.1.el9_8 |
| Oracle Linux 9 | firefox-x11 | 140.15.0-1.0.1.el9_8 |
| Oracle Linux 9 | thunderbird | 140.16.0-1.0.1.el9_8 |
| rapidfort alma 10 | firefox | 0:140.15.0-1.el10_0, 140.15.0-1.el10_2 |
| rapidfort alma 10 | thunderbird | 0:140.15.0-1.el10_0, 140.16.0-1.el10_2.alma.1 |
| rapidfort alma 9 | firefox | 0:140.15.0-1.el9_2, 140.15.0-1.el9_8.alma.1 |
| rapidfort alma 9 | firefox-x11 | 0:140.15.0-1.el9_2, 140.15.0-1.el9_8.alma.1 |
| rapidfort alma 9 | thunderbird | 0:140.15.0-1.el9_2, 140.16.0-1.el9_8.alma.1 |
| rapidfort alpine 3.20 | firefox | no fix listed |
| rapidfort alpine 3.20 | thunderbird | 144.0-r0, 145.0-r1, 151.0.1-r1 |
| rapidfort alpine 3.21 | firefox | no fix listed |
| rapidfort alpine 3.21 | thunderbird | 144.0-r0, 145.0-r1, 151.0.1-r1 |
| rapidfort alpine 3.22 | firefox | no fix listed |
| rapidfort alpine 3.22 | thunderbird | 144.0-r0, 145.0-r1, 151.0.1-r1 |
| rapidfort alpine 3.23 | firefox | no fix listed |
| rapidfort alpine 3.23 | thunderbird | 145.0-r1, 151.0.1-r1 |
| rapidfort alpine 3.24 | firefox | no fix listed |
| rapidfort alpine 3.24 | thunderbird | 151.0.1-r1 |
| rapidfort amazon linux 2023 | firefox | 140.16.0-1.amzn2023.0.1 |
| rapidfort debian 12 | firefox-esr | 0:140.15.0esr-1, 0:140.15.0esr-1~deb12u1, 0:140.15.0esr-1~deb13u1 |
| rapidfort debian 12 | thunderbird | 0:140.15.0esr-1~deb12u1, 0:140.15.0esr-1~deb13u1, 1:153.2.0esr-1 |
| rapidfort debian 13 | firefox-esr | 0:140.15.0esr-1, 0:140.15.0esr-1~deb12u1, 0:140.15.0esr-1~deb13u1 |
| rapidfort debian 13 | thunderbird | 0:140.15.0esr-1~deb12u1, 0:140.15.0esr-1~deb13u1, 1:153.2.0esr-1 |
| rapidfort fedora 43 | thunderbird | 145.0-1.fc43 |
| rapidfort fedora 43 | thunderbird-librnp-rnp | 145.0-1.fc43 |
| rapidfort Oracle Linux 10 | firefox | 0:140.15.0-1.0.1.el10_2 |
| rapidfort Oracle Linux 10 | thunderbird | 0:140.16.0-1.0.1.el10_2 |
| rapidfort Oracle Linux 9 | firefox | 0:140.15.0-1.0.1.el9_8 |
| rapidfort Oracle Linux 9 | firefox-x11 | 0:140.15.0-1.0.1.el9_8 |
| rapidfort Oracle Linux 9 | thunderbird | 0:140.16.0-1.0.1.el9_8 |
| rapidfort rocky 9 | firefox | 0:140.15.0-1.el9_8 |
| rapidfort rocky 9 | firefox-x11 | 0:140.15.0-1.el9_8 |
| rapidfort rocky 9 | thunderbird | 0:140.16.0-1.el9_8 |
| rapidfort ubuntu 20.04 | thunderbird | no fix listed |
| rapidfort ubuntu 22.04 | thunderbird | no fix listed |
| rapidfort ubuntu 24.04 | thunderbird | no fix listed |
| Red Hat | firefox | no fix listed |
| Red Hat | thunderbird | no fix listed |
| rocky 10 | firefox | 140.15.0-1.el10_2 |
| rocky 10 | thunderbird | 140.16.0-1.el10_2 |
| rocky 8 | firefox | 140.15.0-1.el8_10 |
| rocky 8 | thunderbird | 140.16.0-1.el8_10 |
| rocky 9 | firefox | 140.15.0-1.el9_8 |
| rocky 9 | firefox-x11 | 140.15.0-1.el9_8 |
| rocky 9 | thunderbird | 140.16.0-1.el9_8 |
| ubuntu 22.04 | thunderbird | no fix listed |
| wolfi | firefox | 155.0.1-r0 |
References
- https://access.redhat.com/errata/RHSA-2026:70642
- https://access.redhat.com/security/cve/CVE-2026-84143
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2048793%2C2054645%2C2057114%2C2059109%2C2061287
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=2054631%2C2054657%2C2055007%2C2055681%2C2057107%2C2058087%2C2058088%2C2058090%2C2058095%2C2058101%2C2059183%2C2059185%2C2061301%2C2061325
- https://bugzilla.mozilla.org/show_bug.cgi?id=2057108
- https://bugzilla.redhat.com/2503504
- https://bugzilla.redhat.com/2517832
- https://bugzilla.redhat.com/2526753
All 152 references
- https://bugzilla.redhat.com/2526760
- https://bugzilla.redhat.com/2526764
- https://bugzilla.redhat.com/2526765
- https://bugzilla.redhat.com/2526767
- https://bugzilla.redhat.com/2526778
- https://bugzilla.redhat.com/2526781
- https://bugzilla.redhat.com/2527113
- https://bugzilla.redhat.com/2527115
- https://bugzilla.redhat.com/2527116
- https://bugzilla.redhat.com/2533737
- https://bugzilla.redhat.com/2533740
- https://bugzilla.redhat.com/2533741
- https://bugzilla.redhat.com/2533742
- https://bugzilla.redhat.com/2533743
- https://bugzilla.redhat.com/2533747
- https://bugzilla.redhat.com/2533751
- https://bugzilla.redhat.com/2533753
- https://bugzilla.redhat.com/2533757
- https://bugzilla.redhat.com/2533758
- https://bugzilla.redhat.com/2533760
- https://bugzilla.redhat.com/2533762
- https://bugzilla.redhat.com/2533764
- https://bugzilla.redhat.com/2533769
- https://bugzilla.redhat.com/2533770
- https://bugzilla.redhat.com/2533771
- https://bugzilla.redhat.com/2533773
- https://bugzilla.redhat.com/2533774
- https://bugzilla.redhat.com/2533778
- https://bugzilla.redhat.com/2533779
- https://bugzilla.redhat.com/2533781
- https://bugzilla.redhat.com/2533786
- https://bugzilla.redhat.com/2533790
- https://bugzilla.redhat.com/2533791
- https://bugzilla.redhat.com/2533792
- https://bugzilla.redhat.com/2533793
- https://bugzilla.redhat.com/2533797
- https://bugzilla.redhat.com/2533799
- https://bugzilla.redhat.com/2534187
- https://bugzilla.redhat.com/2534197
- https://bugzilla.redhat.com/2534199
- https://bugzilla.redhat.com/show_bug.cgi?id=2503504
- https://bugzilla.redhat.com/show_bug.cgi?id=2517832
- https://bugzilla.redhat.com/show_bug.cgi?id=2526753
- https://bugzilla.redhat.com/show_bug.cgi?id=2526760
- https://bugzilla.redhat.com/show_bug.cgi?id=2526764
- https://bugzilla.redhat.com/show_bug.cgi?id=2526765
- https://bugzilla.redhat.com/show_bug.cgi?id=2526767
- https://bugzilla.redhat.com/show_bug.cgi?id=2526773
- https://bugzilla.redhat.com/show_bug.cgi?id=2526778
- https://bugzilla.redhat.com/show_bug.cgi?id=2526781
- https://bugzilla.redhat.com/show_bug.cgi?id=2527113
- https://bugzilla.redhat.com/show_bug.cgi?id=2527115
- https://bugzilla.redhat.com/show_bug.cgi?id=2527116
- https://bugzilla.redhat.com/show_bug.cgi?id=2533737
- https://bugzilla.redhat.com/show_bug.cgi?id=2533740
- https://bugzilla.redhat.com/show_bug.cgi?id=2533741
- https://bugzilla.redhat.com/show_bug.cgi?id=2533742
- https://bugzilla.redhat.com/show_bug.cgi?id=2533743
- https://bugzilla.redhat.com/show_bug.cgi?id=2533747
- https://bugzilla.redhat.com/show_bug.cgi?id=2533751
- https://bugzilla.redhat.com/show_bug.cgi?id=2533753
- https://bugzilla.redhat.com/show_bug.cgi?id=2533757
- https://bugzilla.redhat.com/show_bug.cgi?id=2533758
- https://bugzilla.redhat.com/show_bug.cgi?id=2533760
- https://bugzilla.redhat.com/show_bug.cgi?id=2533762
- https://bugzilla.redhat.com/show_bug.cgi?id=2533764
- https://bugzilla.redhat.com/show_bug.cgi?id=2533769
- https://bugzilla.redhat.com/show_bug.cgi?id=2533770
- https://bugzilla.redhat.com/show_bug.cgi?id=2533771
- https://bugzilla.redhat.com/show_bug.cgi?id=2533773
- https://bugzilla.redhat.com/show_bug.cgi?id=2533774
- https://bugzilla.redhat.com/show_bug.cgi?id=2533778
- https://bugzilla.redhat.com/show_bug.cgi?id=2533779
- https://bugzilla.redhat.com/show_bug.cgi?id=2533781
- https://bugzilla.redhat.com/show_bug.cgi?id=2533786
- https://bugzilla.redhat.com/show_bug.cgi?id=2533790
- https://bugzilla.redhat.com/show_bug.cgi?id=2533791
- https://bugzilla.redhat.com/show_bug.cgi?id=2533792
- https://bugzilla.redhat.com/show_bug.cgi?id=2533793
- https://bugzilla.redhat.com/show_bug.cgi?id=2533797
- https://bugzilla.redhat.com/show_bug.cgi?id=2533799
- https://bugzilla.redhat.com/show_bug.cgi?id=2534187
- https://bugzilla.redhat.com/show_bug.cgi?id=2534197
- https://bugzilla.redhat.com/show_bug.cgi?id=2534199
- https://creativecommons.org/licenses/by/4.0/
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-16365
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-75874
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84119
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84120
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84121
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84122
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84124
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84131
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84143
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84145
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84639
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84640
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-84641
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92005
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92006
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92007
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92008
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92009
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92010
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92011
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92012
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92013
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92014
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92015
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92016
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92017
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92018
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92019
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92020
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92021
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92022
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92023
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92024
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92025
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92026
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92027
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92028
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92029
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92030
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92031
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92032
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92238
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92239
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-92240
- https://errata.almalinux.org/9/ALSA-2026-70642.html
- https://errata.rockylinux.org/RLSA-2026:70642
- https://linux.oracle.com/cve/CVE-2026-84143.html
- https://linux.oracle.com/errata/ELSA-2026-73971.html
- https://nvd.nist.gov/vuln/detail/CVE-2026-84143
- https://www.cve.org/CVERecord?id=CVE-2026-84143
- https://www.mozilla.org/en-US/security/advisories/mfsa2026-82/#CVE-2026-84143
- https://www.mozilla.org/security/advisories/mfsa2026-82/
- https://www.mozilla.org/security/advisories/mfsa2026-84/
- https://www.mozilla.org/security/advisories/mfsa2026-84/#CVE-2026-84143
- https://www.mozilla.org/security/advisories/mfsa2026-85/
- https://www.mozilla.org/security/advisories/mfsa2026-86/
- https://www.mozilla.org/security/advisories/mfsa2026-87/
- https://www.mozilla.org/security/advisories/mfsa2026-87/#CVE-2026-84143
- https://www.mozilla.org/security/advisories/mfsa2026-88/