CVE-2026-6786

EUVD-2026-24127
Memory safety bugs present in Firefox ESR 140.9, Thunderbird ESR 140.9, Firefox 149 and Thunderbird 149. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
7.5 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 39%
Affected Products (NVD)
VendorProductVersion
mozillafirefox
𝑥
< 150.0
mozillafirefox_esr
140.0 ≤
𝑥
< 140.10.0
mozillathunderbird_esr
140.0 ≤
𝑥
< 140.10.0
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
Red HatRed Hat Enterprise Linux 10
0:140.10.0-1.el10_1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10
0:140.10.0-1.el10_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10
0:140.10.0-1.el10_1 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10
0:140.10.0-1.el10_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
0:140.10.0-1.el10_0 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
0:140.10.0-1.el10_0 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support
0:140.10.0-2.el7_9 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
0:140.10.0-1.el8_10 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
0:140.10.0-1.el8_10 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:140.10.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:140.10.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
0:140.10.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
0:140.10.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
0:140.10.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
0:140.10.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Service
0:140.10.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Telecommunications Update Service
0:140.10.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutions
0:140.10.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Update Services for SAP Solutions
0:140.10.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
0:140.10.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
0:140.10.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
0:140.10.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
0:140.10.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:140.10.0-1.el9_7 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:140.10.0-1.el9_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:140.10.0-1.el9_7 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:140.10.1-1.el9_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutions
0:140.10.0-1.el9_0 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.0 Update Services for SAP Solutions
0:140.10.0-1.el9_0 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
0:140.10.0-1.el9_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
0:140.10.0-1.el9_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.4 Extended Update Support
0:140.10.0-1.el9_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.4 Extended Update Support
0:140.10.0-1.el9_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
0:140.10.0-1.el9_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
0:140.10.0-1.el9_6 ≤
𝑥
< *
ADP
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
152.0.6-1
fixed
firefox-esr
bookworm
140.12.0esr-1~deb12u1
fixed
bookworm (security)
140.13.0esr-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
140.13.0esr-1~deb11u1
fixed
forky
140.12.0esr-1
fixed
sid
140.13.0esr-2
fixed
trixie
140.12.0esr-1~deb13u1
fixed
trixie (security)
140.13.0esr-1~deb13u1
fixed
thunderbird
bookworm
1:140.12.0esr-1~deb12u1
fixed
bookworm (security)
1:140.12.0esr-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
1:140.12.0esr-1~deb11u1
fixed
forky
1:140.12.0esr-1
fixed
sid
1:140.12.0esr-1
fixed
trixie
1:140.12.0esr-1~deb13u1
fixed
trixie (security)
1:140.12.0esr-1~deb13u1
fixed
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
MozillaFirefox
suse enterprise desktop 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise server 12 SP3
140.10.0-112.310.1
fixed
suse enterprise server 12 SP5
140.10.0-112.310.1
fixed
suse enterprise server 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP7
140.10.0-150200.152.231.1
fixed
MozillaFirefox-devel
suse enterprise desktop 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise server 12 SP3
140.10.0-112.310.1
fixed
suse enterprise server 12 SP5
140.10.0-112.310.1
fixed
suse enterprise server 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP7
140.10.0-150200.152.231.1
fixed
MozillaFirefox-translations-common
suse enterprise desktop 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise server 12 SP3
140.10.0-112.310.1
fixed
suse enterprise server 12 SP5
140.10.0-112.310.1
fixed
suse enterprise server 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP7
140.10.0-150200.152.231.1
fixed
MozillaFirefox-translations-other
suse enterprise desktop 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise sap 15 SP7
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP4
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP5
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP6
140.10.0-150200.152.231.1
fixed
suse enterprise server 15 SP7
140.10.0-150200.152.231.1
fixed
MozillaThunderbird
suse enterprise desktop 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise sap 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise server 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise workstation 15 SP7
140.10.1-150200.8.271.1
fixed
MozillaThunderbird-translations-common
suse enterprise desktop 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise sap 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise server 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise workstation 15 SP7
140.10.1-150200.8.271.1
fixed
MozillaThunderbird-translations-other
suse enterprise desktop 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise sap 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise server 15 SP7
140.10.1-150200.8.271.1
fixed
suse enterprise workstation 15 SP7
140.10.1-150200.8.271.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
firefox
RHEL 9
0:140.10.0-1.el9_8
fixed
firefox-x11
RHEL 9
0:140.10.0-1.el9_8
fixed
thunderbird
RHEL 9
0:140.10.1-1.el9_8
fixed
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
firefox
Amazon Linux 2023
0:140.10.1-1.amzn2023.0.1
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.10.1-1.amzn2023.0.1
fixed
firefox-debugsource
Amazon Linux 2023
0:140.10.1-1.amzn2023.0.1
fixed
thunderbird
Amazon Linux 2
0:140.10.0-1.amzn2.0.1
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/buglist.cgi?bug_id=2010727%2C2019004%2C2019224%2C2019547%2C2020378%2C2022381%2C2022608%2C2022785%2C2023120%2C2023128%2C2023140%2C2023279%2C2023836%2C2023882%2C2023925%2C2023950%2C2023959%2C2023965%2C2024243%2C2024245%2C2024247%2C2024253%2C2024346%2C2024357%2C2024416%2C2024420%2C2024429%2C2024432%2C2024455%2C2024466%2C2024468%2C2024476%2C2024664%2C2024666%2C2024669%2C2024670%2C2024671%2C2024761%2C2024918%2C2025292%2C2025332%2C2025348%2C2025384%2C2025395%2C2025458%2C2025461%2C2025463%2C2025481%2C2025483%2C2025485%2C2025494%2C2025506%2C2025511%2C2025513%2C2025520%2C2026277%2C2026282%2C2026288%2C2026289%2C2026311%2C2026312%2C2026869%2C2027152%2C2027161%2C2027238%2C2027261%2C2027269%2C2027274%2C2027280%2C2027281%2C2027300%2C2027302%2C2027331%2C2027339%2C2027340%2C2027738%2C2027975%2C2028000%2C2028011%2C2028289%2C2028525%2C2028728%2C2028887%2C2028888%2C2028896%2C2029063%2C2029064%2C2029290%2C2029291%2C2029294%2C2029300%2C2029304%2C2029316%2C2029317%2C2029401%2C2029415%2C2029430%2C2029457%2C2029727%2C2029735%2C2029743%2C2029752%2C2029754%2C2029776%2C2029809%2C2030324%2C2030370
https://www.mozilla.org/security/advisories/mfsa2026-30/
https://www.mozilla.org/security/advisories/mfsa2026-32/
https://www.mozilla.org/security/advisories/mfsa2026-33/
https://www.mozilla.org/security/advisories/mfsa2026-34/
https://access.redhat.com/errata/RHSA-2026:10757
https://access.redhat.com/errata/RHSA-2026:10766
https://access.redhat.com/errata/RHSA-2026:10767
https://access.redhat.com/errata/RHSA-2026:12285
https://access.redhat.com/errata/RHSA-2026:13537
https://access.redhat.com/errata/RHSA-2026:15892
https://access.redhat.com/errata/RHSA-2026:17477
https://access.redhat.com/errata/RHSA-2026:17687
https://access.redhat.com/errata/RHSA-2026:17688
https://access.redhat.com/errata/RHSA-2026:17689
https://access.redhat.com/errata/RHSA-2026:17690
https://access.redhat.com/errata/RHSA-2026:19041
https://access.redhat.com/errata/RHSA-2026:19131
https://access.redhat.com/errata/RHSA-2026:19201
https://access.redhat.com/errata/RHSA-2026:19348
https://access.redhat.com/errata/RHSA-2026:19461
https://access.redhat.com/errata/RHSA-2026:19462
https://access.redhat.com/errata/RHSA-2026:19463
https://access.redhat.com/errata/RHSA-2026:19464
https://access.redhat.com/errata/RHSA-2026:19465
https://access.redhat.com/errata/RHSA-2026:19466
https://access.redhat.com/errata/RHSA-2026:19467
https://access.redhat.com/errata/RHSA-2026:19468
https://access.redhat.com/errata/RHSA-2026:19469
https://access.redhat.com/errata/RHSA-2026:19542
https://access.redhat.com/errata/RHSA-2026:19655
https://access.redhat.com/errata/RHSA-2026:19704
https://access.redhat.com/security/cve/CVE-2026-6786
https://bugzilla.redhat.com/show_bug.cgi?id=2460088
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-6786.json