CVE-2025-1942

—

CVSS 3.1

9.8 critical

EPSS

<1%p39

Published

Mar 4, 2025 (Mar 4, 2025)

Modified

Jun 17, 2026

Description

When String.toUpperCase() caused a string to get longer it was possible for uninitialized memory to be incorporated into the result string. This vulnerability was fixed in Firefox 136 and Thunderbird 136.

Vendors: mozilla
Products: firefox, thunderbird
Weakness: CWE-908
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.5%)

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