CVE-2026-8956

EUVD-2026-30904
Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
9.8 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 48.82%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mozillafirefox
𝑥
< 151.0.0
CNA
mozillafirefox_esr
116.0.0 ≤
𝑥
< 140.11.0
CNA
mozillathunderbird
𝑥
< 151.0.0
CNA
mozillathunderbird_esr
𝑥
< 140.11
CNA
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
157.0-1
fixed
firefox-esr
bookworm
140.12.0esr-1~deb12u1
fixed
bookworm (security)
140.16.0esr-1~deb12u1
fixed
forky
140.16.0esr-1
fixed
sid
153.4.0esr-1
fixed
trixie
140.15.0esr-1~deb13u1
fixed
trixie (security)
153.4.0esr-1~deb13u1
fixed
thunderbird
bookworm
1:140.12.0esr-1~deb12u1
fixed
bookworm (security)
1:140.17.0esr-1~deb12u1
fixed
forky
1:140.14.0esr-1
fixed
sid
1:153.4.0esr-1
fixed
trixie
1:140.12.0esr-1~deb13u1
fixed
trixie (security)
1:140.17.0esr-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 12 SP5
140.11.0-112.318.1
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 12 SP5
140.11.0-112.318.1
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 12 SP5
140.11.0-112.318.1
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
Amazon Linux logo
Amazon Linux Releases
Amazon Package
Release
firefox
Amazon Linux 2023
0:140.11.0-1.amzn2023.0.1
fixed
firefox-debuginfo
Amazon Linux 2023
0:140.11.0-1.amzn2023.0.1
fixed
firefox-debugsource
Amazon Linux 2023
0:140.11.0-1.amzn2023.0.1
fixed
thunderbird
Amazon Linux 2
0:140.11.1-1.amzn2.0.2
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2032427
https://www.mozilla.org/security/advisories/mfsa2026-46/
https://www.mozilla.org/security/advisories/mfsa2026-48/
https://www.mozilla.org/security/advisories/mfsa2026-50/
https://www.mozilla.org/security/advisories/mfsa2026-51/