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CVE-2019-17026

8.8
HIGHCVSS v3.1 Base Score
56.19%
MEDIUM RiskEPSS (98th percentile)
KEV

Incorrect alias information in IonMonkey JIT compiler for setting array elements could lead to a type confusion. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Firefox ESR < 68.4.1, Thunderbird < 68.4.1, and Firefox < 72.0.1.

Published: 3/2/2020
Modified: 11/4/2025
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Mozilla Firefox And Thunderbird Type Confusion Vulnerability

Vendor / Product:

Mozilla Firefox and Thunderbird

Required Action:

Apply updates per vendor instructions.

Due Date: 5/3/2022(OVERDUE)
Added to KEV:

11/3/2021

Notes:

https://nvd.nist.gov/vuln/detail/CVE-2019-17026

Vulnerability Summary

CVSS v3 Score

8.8HIGH

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

CVSS v2 Score

6.8

AV:N/AC:M/Au:N/C:P/I:P/A:P

EPSS Score (Exploitation Probability)

56.19%MEDIUM Exploitation Risk
98th percentile

This vulnerability has a 56.19% probability of being exploited in the next 30 days, ranking higher than 98% of all scored CVEs.

CWE Classification

Related Vulnerabilities

Same Weakness Type(CWE-843)

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iccDEV provides a set of libraries and tools that allow for the interaction, manipulation, and application of International Color Consortium (ICC) color management profiles. Versions prior to 2.3.1.2 have a Type Confusion vulnerability in `ToXmlCurve()` at `IccXML/IccLibXML/IccMpeXml.cpp`. This vulnerability affects users of the iccDEV library who process ICC color profiles. Version 2.3.1.2 contains a patch. No known workarounds are available.

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Type confusion in V8 in Google Chrome prior to 140.0.7339.185 allowed a remote attacker to potentially exploit heap corruption via a crafted HTML page. (Chromium security severity: High)

9/24/2025

Similar SeverityHIGH