CVE-2026-109724

EUVD-2026-98494
Use-after-free in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
5.4 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 11.32%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mozillafirefox
𝑥
< 158
CNA
mozillafirefox_esr
116.0.0 ≤
𝑥
< 153.5
CNA
mozillathunderbird
𝑥
< 158
CNA
mozillathunderbird_esr
𝑥
< 153.5
CNA
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
vulnerable
firefox-esr
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
153.5.0esr-1
fixed
trixie
vulnerable
trixie (security)
153.5.0esr-1~deb13u1
fixed
thunderbird
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
vulnerable
trixie (security)
vulnerable
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
jammy
not-affected
noble
not-affected
resolute
not-affected
thunderbird
jammy
needed
noble
not-affected
resolute
not-affected
mozjs38
bionic
needs-triage
jammy
dne
noble
dne
resolute
dne
mozjs52
bionic
ignored
focal
ignored
jammy
dne
noble
dne
resolute
dne
mozjs68
focal
ignored
jammy
dne
noble
dne
resolute
dne
mozjs78
jammy
ignored
noble
dne
resolute
dne
mozjs91
jammy
ignored
noble
dne
resolute
dne
mozjs102
jammy
ignored
noble
ignored
resolute
dne
mozjs115
jammy
dne
noble
ignored
resolute
dne
Common Weakness Enumeration
Vulnerability Media Exposure
References
https://bugzilla.mozilla.org/show_bug.cgi?id=2074193
https://www.mozilla.org/security/advisories/mfsa2026-106/
https://www.mozilla.org/security/advisories/mfsa2026-108/
https://www.mozilla.org/security/advisories/mfsa2026-109/
https://www.mozilla.org/security/advisories/mfsa2026-110/