PT-2026-49690 · Mozilla · Firefox+1

Junyoung Park

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CVE-2026-12321

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Published

2026-06-16

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Updated

2026-07-25

CVSS v2.0

6.4

Medium

VectorAV:N/AC:L/Au:N/C:P/I:P/A:N
Name of the Vulnerable Software and Affected Versions Firefox versions prior to 152 Thunderbird versions prior to 152
Description JIT miscompilation occurs in the JavaScript: WebAssembly component. Just-In-Time (JIT) compilation is a method used to improve the execution speed of programs by compiling code during runtime rather than before execution.
Recommendations Update Firefox to version 152. Update Thunderbird to version 152.

Fix

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dbugs@ptsecurity.com

Weakness Enumeration

CWE-670

Related Identifiers

BDU:2026-11254
CVE-2026-12321
OPENSUSE-SU-2026:11052-1
OPENSUSE-SU-2026:11373-1

Affected Products

Firefox
Thunderbird