CVE-2026-0878

EUVD-2026-2340
Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component. This vulnerability was fixed in Firefox 147, Firefox ESR 140.7, Thunderbird 147, and Thunderbird 140.7.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8 HIGH
NETWORK
HIGH
NONE
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 10%
Affected Products (NVD)
VendorProductVersion
mozillafirefox_esr
𝑥
< 140.7.0
mozillafirefox
𝑥
< 147.0
mozillathunderbird_esr
𝑥
< 140.7.0
mozillathunderbird
𝑥
< 147.0
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
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise server 12 SP3
140.7.0-112.295.1
fixed
suse enterprise server 12 SP5
140.7.0-112.295.1
fixed
suse enterprise server 15 SP2
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.152.216.1
fixed
MozillaFirefox-devel
suse enterprise desktop 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise server 12 SP3
140.7.0-112.295.1
fixed
suse enterprise server 12 SP5
140.7.0-112.295.1
fixed
suse enterprise server 15 SP2
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.152.216.1
fixed
MozillaFirefox-translations-common
suse enterprise desktop 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise server 12 SP3
140.7.0-112.295.1
fixed
suse enterprise server 12 SP5
140.7.0-112.295.1
fixed
suse enterprise server 15 SP2
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.152.216.1
fixed
MozillaFirefox-translations-other
suse enterprise desktop 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP2
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP4
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP5
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP6
140.7.0-150200.152.216.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.152.216.1
fixed
MozillaThunderbird
suse enterprise desktop 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise workstation 15 SP7
140.7.0-150200.8.251.1
fixed
MozillaThunderbird-translations-common
suse enterprise desktop 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise workstation 15 SP7
140.7.0-150200.8.251.1
fixed
MozillaThunderbird-translations-other
suse enterprise desktop 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise sap 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise server 15 SP7
140.7.0-150200.8.251.1
fixed
suse enterprise workstation 15 SP7
140.7.0-150200.8.251.1
fixed
Red Hat logo
Red Hat Enterprise Linux Releases
Red Hat Product
Release
firefox
RHEL 9
0:140.7.0-1.el9_7
fixed
firefox-x11
RHEL 9
0:140.7.0-1.el9_7
fixed
thunderbird
RHEL 9
0:140.7.0-1.el9_7
fixed
Common Weakness Enumeration
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2003989
https://www.mozilla.org/security/advisories/mfsa2026-01/
https://www.mozilla.org/security/advisories/mfsa2026-03/
https://www.mozilla.org/security/advisories/mfsa2026-04/
https://www.mozilla.org/security/advisories/mfsa2026-05/