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CVE

CVE-2026-4690

firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (important)
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CVE

CVE-2026-4690

firefox: thunderbird: Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component (important)

DOCUMENTATION: A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:

Sandbox escape due to incorrect boundary conditions, integer overflow in the XPCOM component 

            STATEMENT: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.6
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
C
H
U
-
C
H
U
-

Related Resources

No items found.

References

https://access.redhat.com/security/cve/CVE-2026-4690

Severity

0

CVSS Score
0
10

Basic Information

Ecosystem
Base CVSS
0
EPSS Probability
0.0002%
EPSS Percentile
0.0601%
Introduced Version
0
Fix Available
0:140.9.0-1.el8_10,0:140.9.0-1.el9_7,140.9.0esr-1~deb11u1,1:140.9.0esr-1~deb11u1,140.9.0esr-1~deb12u1,1:140.9.0esr-1~deb12u1,140.9.0esr-1~deb13u1,1:140.9.0esr-1~deb13u1,0:140.9.0-1.0.1.el8_10,0:140.9.0-1.0.1.el9_7,0:140.9.0-1.amzn2.0.2,0:140.9.0-1.amzn2023.0.2,149.0-r0

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