CVE-2026-8391

EUVD-2026-29466
Other issue in the JavaScript Engine component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
5.3 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 22.08%
Affected Products (NVD)
VendorProductVersion
mozillafirefox
𝑥
< 150.0.3
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
Red HatRed Hat Enterprise Linux 10
0:140.11.0-1.el10_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10
0:140.11.0-1.el10_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
0:140.11.0-1.el10_0 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 10.0 Extended Update Support
0:140.11.0-1.el10_0 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 7 Extended Lifecycle Support
0:140.11.0-1.el7_9 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
0:140.11.0-1.el8_10 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8
0:140.11.0-1.el8_10 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:140.11.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
0:140.11.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
0:140.11.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
0:140.11.0-1.el8_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
0:140.11.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
0:140.11.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
0:140.11.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
0:140.11.0-1.el8_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
0:140.11.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Telecommunications Update Service
0:140.11.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
0:140.11.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 8.8 Update Services for SAP Solutions
0:140.11.0-1.el8_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:140.11.0-1.el9_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9
0:140.11.0-1.el9_8 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
0:140.11.0-1.el9_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.2 Update Services for SAP Solutions
0:140.11.0-1.el9_2 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions
0:140.11.0-1.el9_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.4 Update Services for SAP Solutions
0:140.11.0-1.el9_4 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
0:140.11.0-1.el9_6 ≤
𝑥
< *
ADP
Red HatRed Hat Enterprise Linux 9.6 Extended Update Support
0:140.11.0-1.el9_6 ≤
𝑥
< *
ADP
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
153.0.3-1
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
140.13.0esr-2
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
1:140.13.0esr-2
fixed
trixie
1:140.12.0esr-1~deb13u1
fixed
trixie (security)
1:140.12.0esr-1~deb13u1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
jammy
not-affected
noble
not-affected
questing
not-affected
resolute
not-affected
mozjs102
jammy
ignored
noble
ignored
questing
dne
resolute
dne
mozjs115
jammy
dne
noble
ignored
questing
dne
resolute
dne
mozjs38
bionic
needs-triage
jammy
dne
noble
dne
questing
dne
resolute
dne
mozjs52
bionic
ignored
focal
ignored
jammy
dne
noble
dne
questing
dne
resolute
dne
mozjs68
focal
ignored
jammy
dne
noble
dne
questing
dne
resolute
dne
mozjs78
jammy
ignored
noble
dne
questing
dne
resolute
dne
mozjs91
jammy
ignored
noble
dne
questing
dne
resolute
dne
thunderbird
jammy
needed
noble
not-affected
questing
not-affected
resolute
not-affected
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
MozillaFirefox
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 12 SP3
140.11.0-112.318.1
fixed
suse enterprise server 12 SP5
140.11.0-112.318.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaFirefox-devel
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 12 SP3
140.11.0-112.318.1
fixed
suse enterprise server 12 SP5
140.11.0-112.318.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaFirefox-translations-common
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 12 SP3
140.11.0-112.318.1
fixed
suse enterprise server 12 SP5
140.11.0-112.318.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaFirefox-translations-other
suse enterprise desktop 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP4
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP5
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP6
140.11.0-150200.152.239.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.152.239.1
fixed
MozillaThunderbird
suse enterprise desktop 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise workstation 15 SP7
140.11.0-150200.8.274.1
fixed
MozillaThunderbird-translations-common
suse enterprise desktop 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise workstation 15 SP7
140.11.0-150200.8.274.1
fixed
MozillaThunderbird-translations-other
suse enterprise desktop 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise sap 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise server 15 SP7
140.11.0-150200.8.274.1
fixed
suse enterprise workstation 15 SP7
140.11.0-150200.8.274.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
firefox
RHEL 9
0:140.11.0-1.el9_8
fixed
firefox-x11
RHEL 9
0:140.11.0-1.el9_8
fixed
thunderbird
RHEL 9
0:140.11.0-1.el9_8
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2038575
https://www.mozilla.org/security/advisories/mfsa2026-45/
https://www.mozilla.org/security/advisories/mfsa2026-47/
https://www.mozilla.org/security/advisories/mfsa2026-48/
https://www.mozilla.org/security/advisories/mfsa2026-51/
https://access.redhat.com/errata/RHSA-2026:21378
https://access.redhat.com/errata/RHSA-2026:21380
https://access.redhat.com/errata/RHSA-2026:21381
https://access.redhat.com/errata/RHSA-2026:21382
https://access.redhat.com/errata/RHSA-2026:22325
https://access.redhat.com/errata/RHSA-2026:22643
https://access.redhat.com/errata/RHSA-2026:26174
https://access.redhat.com/errata/RHSA-2026:26268
https://access.redhat.com/errata/RHSA-2026:26269
https://access.redhat.com/errata/RHSA-2026:26270
https://access.redhat.com/errata/RHSA-2026:26491
https://access.redhat.com/errata/RHSA-2026:26492
https://access.redhat.com/errata/RHSA-2026:26493
https://access.redhat.com/errata/RHSA-2026:26521
https://access.redhat.com/errata/RHSA-2026:26536
https://access.redhat.com/errata/RHSA-2026:26539
https://access.redhat.com/errata/RHSA-2026:26551
https://access.redhat.com/errata/RHSA-2026:26606
https://access.redhat.com/errata/RHSA-2026:26629
https://access.redhat.com/errata/RHSA-2026:26630
https://access.redhat.com/errata/RHSA-2026:27715
https://access.redhat.com/security/cve/CVE-2026-8391
https://bugzilla.redhat.com/show_bug.cgi?id=2476475
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-8391.json