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CVE-2019-9791

CriticalPublished

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey...

Published: Apr 26, 2019
Updated: Aug 4, 2024
Assigning CNA: mozilla
Evidence observed: Mar 26, 2019

Primary CVSS

9.8/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

19.9%

Moderate · next 30 days

Percentile: 97.4%
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

The type inference system allows the compilation of functions that can cause type confusions between arbitrary objects when compiled through the IonMonkey just-in-time (JIT) compiler and when the constructor function is entered through on-stack replacement (OSR). This allows for possible arbitrary reading and writing of objects during an exploitable crash. This vulnerability affects Thunderbird < 60.6, Firefox ESR < 60.6, and Firefox < 66.

Sources

CVE-2019-9791Exploit
Exploit chain for CVE-2019-9791 & CVE-2019-11708 against firefox 65.0 on windows 64bit
Spidermonkey - IonMonkey Type Inference is Incorrect for Constructors Entered via OSRExploit
Google Security Research · multiple · Mar 26, 2019

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