Back

HIGH

Mozilla: Ionmonkey type confusion with __proto__ mutations

Published Apr 26, 2019

Description

Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.

Affected products

Remediation

Red Hat statement

In general, this flaw can be exploited through email in the Thunderbird product because scripting is disabled when reading mail, but are potentially risks in browser or browser-like contexts.

Weaknesses (1)

References (11)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mozilla
Published Apr 26, 2019
Updated Aug 4, 2024
Reserved Mar 14, 2019
NVD
Status Modified
Modified Jun 17, 2026
Red Hat
Severity Critical
Public date Mar 22, 2019