Vulnerability · NVD

CVE-2026-8956

HIGH 9.8 Published on 2026-05-19

Integer overflow in the Networking: JAR component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Attack vector : Network No privileges required No user interaction

Show raw CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS 0.06% exploit very unlikely percentile 20.0%

Tracked apps referencing this CVE

For each app: the affected range, the fixing version, and where the tracked app stands today.

Mozilla Thunderbird Windows winget:Mozilla.Thunderbird

Affected <151.0.0 Fixed in 151.0.0 Latest tracked 151.0.1 patched

Vulnerable CPE configurations (2)

Vendor	Product	Platform	Versions	CPE 2.3 URI
mozilla	thunderbird All platforms (wildcard)	All platforms (wildcard)	<140.11	cpe:2.3:a:mozilla:thunderbird:::::esr:::*
mozilla	thunderbird All platforms (wildcard)	All platforms (wildcard)	<151.0.0	cpe:2.3:a:mozilla:thunderbird::::::::

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