rootpwn

unknown

CVE-2026-109720

A JIT miscompilation flaw in Mozilla Firefox’s WebAssembly engine can cause incorrect code execution when processing WebAssembly modules. Th

Overview

A JIT miscompilation flaw in Mozilla Firefox’s WebAssembly engine can cause incorrect code execution when processing WebAssembly modules. The issue is limited to Firefox versions prior to 158 and the ESR 153.5 release. It was patched in those versions.

Description

JIT miscompilation in the JavaScript: WebAssembly component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.

Impact

The vulnerability can lead to arbitrary code execution or denial of service if an attacker supplies crafted WebAssembly modules. Defenders should be aware that unpatched browsers could be exploited to compromise system integrity or availability.

Remediation

Update all Firefox installations to version 158 or later, or to the ESR 153.5 release or newer. If immediate update is not possible, disable WebAssembly via browser configuration or use a content security policy that blocks WebAssembly execution.

Risk context

Severity is listed as unknown and no CVSS or EPSS scores are available, indicating limited publicly available data. Nonetheless, the potential for arbitrary code execution warrants timely patching.

Affected products

  • Mozilla Firefox
  • Firefox ESR

Scores

Severity
unknown
CVSS v2
—
CVSS v3
—
CVSS v4
—
EPSS
—

JIT WebAssembly Firefox browser miscompilation update defense

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