CVE-2026-2776

EUVD-2026-8498
Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
10 CRITICAL
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: 8%
Affected Products (NVD)
VendorProductVersion
mozillafirefox_esr
𝑥
< 115.33.0
mozillafirefox
𝑥
< 148.0
mozillafirefox_esr
128.0 ≤
𝑥
< 140.8.0
mozillathunderbird_esr
𝑥
< 140.8.0
mozillathunderbird
𝑥
< 148.0
𝑥
= Vulnerable software versions
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
151.0.1-1
fixed
firefox-esr
bookworm
140.10.2esr-1~deb12u1
fixed
bookworm (security)
140.11.0esr-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
140.11.0esr-1~deb11u1
fixed
forky
140.11.0esr-1
fixed
sid
140.11.0esr-1
fixed
trixie
140.10.2esr-1~deb13u1
fixed
trixie (security)
140.11.0esr-1~deb13u1
fixed
thunderbird
bookworm
1:140.10.1esr-1~deb12u1
fixed
bookworm (security)
1:140.11.0esr-1~deb12u1
fixed
bullseye
vulnerable
bullseye (security)
1:140.11.0esr-1~deb11u1
fixed
forky
1:140.11.0esr-1
fixed
sid
1:140.11.0esr-1
fixed
trixie
1:140.10.1esr-1~deb13u1
fixed
trixie (security)
1:140.11.0esr-1~deb13u1
fixed
openSUSE logo
openSUSE / SLES Releases
openSUSE Product
Release
MozillaFirefox
suse enterprise desktop 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise server 12 SP3
140.8.0-112.301.1
fixed
suse enterprise server 12 SP5
140.8.0-112.301.1
fixed
suse enterprise server 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.152.222.1
fixed
MozillaFirefox-devel
suse enterprise desktop 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise server 12 SP3
140.8.0-112.301.1
fixed
suse enterprise server 12 SP5
140.8.0-112.301.1
fixed
suse enterprise server 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.152.222.1
fixed
MozillaFirefox-translations-common
suse enterprise desktop 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise server 12 SP3
140.8.0-112.301.1
fixed
suse enterprise server 12 SP5
140.8.0-112.301.1
fixed
suse enterprise server 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.152.222.1
fixed
MozillaFirefox-translations-other
suse enterprise desktop 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP4
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP5
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP6
140.8.0-150200.152.222.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.152.222.1
fixed
MozillaThunderbird
suse enterprise desktop 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise workstation 15 SP7
140.8.0-150200.8.260.1
fixed
MozillaThunderbird-translations-common
suse enterprise desktop 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise workstation 15 SP7
140.8.0-150200.8.260.1
fixed
MozillaThunderbird-translations-other
suse enterprise desktop 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise sap 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise server 15 SP7
140.8.0-150200.8.260.1
fixed
suse enterprise workstation 15 SP7
140.8.0-150200.8.260.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
firefox
RHEL 9
0:140.8.0-2.el9_7
fixed
firefox-x11
RHEL 9
0:140.8.0-2.el9_7
fixed
thunderbird
RHEL 9
0:140.8.0-1.el9_7
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2015266
https://www.mozilla.org/security/advisories/mfsa2026-13/
https://www.mozilla.org/security/advisories/mfsa2026-14/
https://www.mozilla.org/security/advisories/mfsa2026-15/
https://www.mozilla.org/security/advisories/mfsa2026-16/
https://www.mozilla.org/security/advisories/mfsa2026-17/