Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2019-17026

Access of Resource Using Incompatible Type ('Type Confusion')

Published: Mar 02, 2020 | Modified: Nov 04, 2025
CVSS 3.x
8.8
HIGH
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CVSS 2.x
6.8 MEDIUM
AV:N/AC:M/Au:N/C:P/I:P/A:P
RedHat/V2
RedHat/V3
8.8 CRITICAL
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Ubuntu
MEDIUM
Vulnerability-free packages from our partners
root.io logo minimus.io logo echo.ai logo
Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2019-17026
CWEhttps://cwe.mitre.org/data/definitions/843.html

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.

Weakness

The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.

Affected Software

NameVendorStart VersionEnd Version
FirefoxMozilla*68.4.1 (excluding)
FirefoxMozilla*72.0.1 (excluding)
ThunderbirdMozilla*68.4.1 (excluding)
Red Hat Enterprise Linux 6RedHatfirefox-0:68.4.1-1.el6_10*
Red Hat Enterprise Linux 6RedHatthunderbird-0:68.4.1-2.el6_10*
Red Hat Enterprise Linux 7RedHatfirefox-0:68.4.1-1.el7_7*
Red Hat Enterprise Linux 7RedHatthunderbird-0:68.4.1-2.el7_7*
Red Hat Enterprise Linux 8RedHatfirefox-0:68.4.1-1.el8_1*
Red Hat Enterprise Linux 8RedHatthunderbird-0:68.4.1-2.el8_1*
Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsRedHatthunderbird-0:68.4.1-2.el8_0*
Red Hat Enterprise Linux 8.0 Update Services for SAP SolutionsRedHatfirefox-0:68.4.1-1.el8_0*
FirefoxUbuntubionic*
FirefoxUbuntudevel*
FirefoxUbuntudisco*
FirefoxUbuntueoan*
FirefoxUbuntufocal*
FirefoxUbuntugroovy*
FirefoxUbuntuhirsute*
FirefoxUbuntuimpish*
FirefoxUbuntujammy*
FirefoxUbuntukinetic*
FirefoxUbuntulunar*
FirefoxUbuntumantic*
FirefoxUbuntunoble*
FirefoxUbuntutrusty*
FirefoxUbuntuupstream*
FirefoxUbuntuxenial*
Mozjs38Ubuntubionic*
Mozjs38Ubuntuesm-apps/bionic*
Mozjs38Ubuntuupstream*
Mozjs52Ubuntubionic*
Mozjs52Ubuntudisco*
Mozjs52Ubuntueoan*
Mozjs52Ubuntuesm-apps/focal*
Mozjs52Ubuntuesm-infra/bionic*
Mozjs52Ubuntufocal*
Mozjs52Ubuntugroovy*
Mozjs52Ubuntuupstream*
Mozjs60Ubuntudisco*
Mozjs60Ubuntueoan*
Mozjs60Ubuntuupstream*
ThunderbirdUbuntubionic*
ThunderbirdUbuntudevel*
ThunderbirdUbuntudisco*
ThunderbirdUbuntueoan*
ThunderbirdUbuntufocal*
ThunderbirdUbuntugroovy*
ThunderbirdUbuntuhirsute*
ThunderbirdUbuntuimpish*
ThunderbirdUbuntujammy*
ThunderbirdUbuntukinetic*
ThunderbirdUbuntulunar*
ThunderbirdUbuntumantic*
ThunderbirdUbuntunoble*
ThunderbirdUbuntutrusty*
ThunderbirdUbuntuupstream*
ThunderbirdUbuntuxenial*

Extended Description

When the product accesses the resource using an incompatible type, this could trigger logical errors because the resource does not have expected properties. In languages without memory safety, such as C and C++, type confusion can lead to out-of-bounds memory access. While this weakness is frequently associated with unions when parsing data with many different embedded object types in C, it can be present in any application that can interpret the same variable or memory location in multiple ways. This weakness is not unique to C and C++. For example, errors in PHP applications can be triggered by providing array parameters when scalars are expected, or vice versa. Languages such as Perl, which perform automatic conversion of a variable of one type when it is accessed as if it were another type, can also contain these issues.

References

Aqua Security is the largest pure-play cloud native security company, providing customers the freedom to innovate and run their businesses with minimal friction. The Aqua Cloud Native Security Platform provides prevention, detection, and response automation across the entire application lifecycle to secure the build, secure cloud infrastructure and secure running workloads wherever they are deployed.
Copyright © 2026 Aqua Security Software Ltd.   Privacy Policy | Terms of Use