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CVE-2026-2776
AST
Critical

Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software. This vulnerability was fixed in Firefo…

CVSS
10.0
Critical
EPSS
0.00
p37
Published
2026-01-01
Updated
2026-01-01
Description

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.

Tags · CWE
RCEPre-auth
CWE-119
CAPEC-8
CAPEC-9
CAPEC-10
CAPEC-14
CAPEC-24
CAPEC-42
CAPEC-44
CAPEC-45
CAPEC-46
CAPEC-47
CAPEC-100
CAPEC-123
Affected products
Firefox < 115.33.0Firefox < 148.0Firefox 128.0–140.8.0Thunderbird < 140.8.0Thunderbird < 148.0
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Timeline
2026-01-01
Published
2026-01-01
Updated
CVSS 3.1 breakdown
Attack Vector
AV: N
Network (N)
Attack Complexity
AC: L
Low (L)
Privileges Required
PR: N
None (N)
User Interaction
UI: N
None (N)
Scope
S: C
Changed (C)
Confidentiality Impact
C: H
High (H)
Integrity Impact
I: H
High (H)
Availability Impact
A: H
High (H)
Exploit indicators
EPSS
0.005 · p37
Known exploited (KEV)
No
Known exploits — Сканер-ВС
No Сканер-ВС checks registered for this vulnerability yet.
Affected products
ProductVendorStatus
firefoxTracked
firefoxTracked
firefoxTracked
firefox-esrTracked
thunderbirdTracked
firefox*Tracked
thunderbird*Tracked