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CVE-2026-2768

CriticalPublished

Sandbox escape in the Storage: IndexedDB component

Published: Feb 24, 2026
Updated: Jul 15, 2026
Assigning CNA: mozilla
Evidence observed: Aug 24, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 30.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

Sandbox escape in the Storage: IndexedDB component. This vulnerability was fixed in Firefox 148, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8.

Sources

CVE-2026-2796-and-CVE-2026-2768-escape-the-wasm-boxExploit
Full Firefox chain: CVE-2026-2796 wasm type confusion -> content-process RCE, plus CVE-2026-2768 parent-process escape analysis (both fixed in Firefox 148)

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